The blood in your body. Water in the desert. And oil in an engine. They’re all vital. Without them, someone or something is going to die! Oil is an essential lubricant in your engi...My CR-V says 5000KM or 3000 Miles between changes or 1 year. I know one of my buddies has a RHD version Audi S5 and his also states 5000KM. ... I'm pretty sure the less steep line is a "change the oil …Jul 11, 2023 · Bottom line: DO NOT run your 2.0 EB engine 7,500-10,000 miles between oil changes and DO NOT just rely on the dash display to tell you when to change the oil unless you plan to sell when the factory warranty is up. Otherwise, change your oil roughly every 5,000 miles with a high-quality, 100% synthetic oil and high-quality filter. 15 Mar 2011 ... The accepted oil change interval according to car makers is 3 months or 3 thousand miles whichever is first..But actually oil change interval ...Regular oil and filter changes are the single best thing you can do to keep your vehicle running smoothly for many years. By regularly changing your own oil, you save money as you ...First one on a new car I always do 500 miles. Good idea to change the diff oil then too. After that I go about 7,000 miles between changes using a top tier oil like Amsoil. On the Jeep my oil gauge gets to about 25% at the 7k mile mark. My Trans Am I do once a year but I never drive it.naskie18. 13051 posts · Joined 2003. #2 · Jun 15, 2006. I change the oil every 5000 miles...ish. Somewhere between 5000 and 7500 typically, depends how long it takes me to get free time. Right now, for example, I'm at about 6000 miles, and will probably go another 1000 before I get a chance to change it. Nick.Many modern vehicles use synthetic motor oil, which only requires an oil change every 7,500–15,000 miles depending on the manufacturer’s recommendation. Read More. Other Ways We Can Help.10,000 miles or 12 months. The JK Wrangler saw expanded engine options. The 3.8L V6 and 3.6L Pentastar V6 both call for oil changes every 7,500 miles or 6 months. The 2.8L diesel engine option has longer intervals, with changes needed every 10,000 miles or …Advertisement You can change one fraction into another by one of three methods: Cracking takes large hydrocarbons and breaks them into smaller ones. Advertisement There are several...Increased Offer! Hilton No Annual Fee 70K + Free Night Cert Offer! Southwest’s meltdown is still going on. Passengers are stranded, bags are piling up and there are still many flig...Nov 13, 2017 · Maintenance/Repairs. jbrown70 November 13, 2017, 5:24pm 1. 2014 Toyota RAV4 manual does say 0W-20 has been approved for 10,000 miles or 12 month oil change interval, but local mechanics recommend every 6 month regardless of mileage or every 4,000 miles which wouldn’t hurt, but seems to be an over kill based on Toyota recommendation. fireron. My guess is you did not reset the oil change indicator, therefore the computer just went by your driving habits and mileage combo. Just a thought. But the manual does state 8,000 miles or 6 months for an oil change, whichever comes first, to keep your warranty valid. Many folks on here seem to miss that point.Some transmissions need regular maintenance, and others are dubbed a "lifetime fill" and can go up to 150,000 miles between oil changes. "When in doubt, service the transmission with OEM fluid and ...I typically have been doing 10K miles between oil changes on my normal vehicles. I had planned on doing 7.5 k on the Bronco because of the turbos. But after reading the owner's manual it's clear that 5K oil changes are going to be what's needed unless you do nothing but street driving. I'm personally still unsure about the blend oil.The “every 3,000 miles or every three months” rule is outdated because of advances in both engines and oil. Many automakers have oil-change intervals at 7,500 …The blood in your body. Water in the desert. And oil in an engine. They’re all vital. Without them, someone or something is going to die! Oil is an essential lubricant in your engi...See full list on caranddriver.com Jason went inside Mobil 1's facilities to show us a behind-the-scenes look at how the company makes its Annual Protection motor oil, claimed to go 20,000 miles or 12 months between oil changes ...High-speed highway driving: Change oil every 6,000 miles or six months. Driving on dusty, gravel, sandy or salty roads: Change oil every 3,000 miles, and check …Jul 20, 2011 · the dealer told me every 7,500 miles will be perfect. my light came on at ~3000 miles...i did the pedal trick to turn it off. then got the oil changed at 7,500 miles and haven't seen it sense. i now have 10,3xx miles on it. i will wait atleast til 15,000 miles until the next one. -John. Your engine oil should be changed every 5,000 to 10,000 miles, depending on your vehicle's model year and driving conditions. Many newer Lincoln vehicles have an Intelligent Oil Life Monitor that will inform you when your vehicle needs an oil change. Conditions that could accelerate an oil change interval include towing, short-distance driving ...May 31, 2015 · 4384 posts · Joined 2011. #6 · May 31, 2015. Stay with the synthetic. 5000 miles would be appropriate. Even Dino oil would be 5000 miles between changes after the first change at 1000 miles.some people change every year or every 5000 miles whichever comes first. If you're going to change yearly I would suggest after the end of the summer ... I thought most people go 10k miles between oil changes. Why does Toyota reset the maintenance light for every 5k miles? I’m at 65k and due for an oil change. Just got one done at 60k. Should I wait until 70k? euroshowoff, Oct 29, 2021 #1. Oct 29, 2021 at 5:10 AM #2 #2. SJBlack Well-Known Member. Joined: Feb 26, 2019 Member: #2845571). Sea Foam is made from 100% safe cleaning and lubricating ingredients. It can’t harm engine parts or components, no matter how long they’re in contact with Sea Foam. 2) That said, I’d recommend waiting until you are about 100-300 miles out from your next oil change before adding Sea Foam.Likewise, synthetic oil’s longer lifecycle versus conventional oil has also attracted many, with conventional oil requiring changes every 3,000-5,000 miles and synthetic every 7,500-15,000 miles.9 Jan 2017 ... The owner's manual...diesel....states about 7500 miles for oil change....You have an oil life monitor that will let you know the PCM thinks if ...The Amsoil site has the H-D service bulletin that tells the oil change intervals when using synthetic. You get to go longer between oil changes on the Primary and Tranny. Here's the breakdown (for twin cam engines): Crankcase: Every 5000 miles (no change from regular oil) Primary: Every 10000 miles.Cost me $95 for the oil change because my 2013 Sienna uses over 5 quarts. Now I have done some searching around to find out how long I should go before changing the oil again, and I cannot find a solid answer for this oil. I have seen everything suggested from 3,000 to 15,000 miles. I was just wanting to hear what other Sienna owners have …2 Oct 2004 ... My dealer recommends 5k between oil changes... and ive seen customers come through with close to 10k between oil changes, and the oil doesnt ...My engine just came off warrenty. i switched to synthetic and use the 7500 mile interval, so it gets changed between 7500 and 8500 miles. i dont worry about alot of short trips in winter. When i ran dino oil i stayed with the 3500 mile interval, 1000 miles a month interval (gas was high and the car was sitting alot).Many modern vehicles use synthetic motor oil, which only requires an oil change every 7,500–15,000 miles depending on the manufacturer’s recommendation. Read More. Other Ways We Can Help.How much is an oil change at Walmart? Walmart oil change prices detailed inside, plus information on coupons and discounts. Walmart Auto Care Centers do standard, high-mileage, and...But today’s newer-tech engines often use synthetic-blend oil or full synthetic oil and are engineered to go anywhere from 7,500 to 15,000 miles between oil changes. Yes, synthetic oil changes ...Your engine oil should be changed every 5,000 to 10,000 miles, depending on your vehicle's model year and driving conditions. Many newer Lincoln vehicles have an Intelligent Oil Life Monitor that will inform you when your vehicle needs an oil change. Conditions that could accelerate an oil change interval include towing, short-distance driving ...Nov 24, 2009 · Diesel Engine Service. * Three times (3X) OEM* recommendation, not to exceed 50,000 miles/600 hours or one year, whichever comes first. Drain intervals may be extended further with oil analysis. * 2007-2009 Caterpillar C13, C15 on-highway engines must follow OEM drain interval. 13 Nov 2023 ... Depending on the type of vehicle you own and it's engine, you are most likely throwing away Amsoil every 3000 miles. You may want to consider ...Rating Action: Moody's downgrades Tullow's rating to B2, changes the outlook to negativeVollständigen Artikel bei Moodys lesen Indices Commodities Currencies StocksAccording to Kia, the 2023 Kia Telluride needs an oil change every 7,500 miles or once a year at minimum. Changing the oil will help your engine run better for longer, so it is essential not to delay this service. Kia will likely change your cabin air filter as well at this time. There are a few other items that Kia suggests having done ...Jul 20, 2011 · the dealer told me every 7,500 miles will be perfect. my light came on at ~3000 miles...i did the pedal trick to turn it off. then got the oil changed at 7,500 miles and haven't seen it sense. i now have 10,3xx miles on it. i will wait atleast til 15,000 miles until the next one. -John. The first 3 oil changes. First with 706 Miles on factory oil.. Second with 741 miles on Edge, (1447 miles on car). Third with 1362 miles on Edge, (2809 miles on car). This picture is of the 700 mile factory oil. You can see the junk that settled to the bottom of the jar in this picture. The other 2 jars settled out void of junk. View attachment ...Quick-lube chains say 3,000 miles, auto manufacturers recommend 5,000 to 7,500 miles and synthetic oil companies, 10,000. How often do you really need to …An oil change mileage calculator is a tool that helps you estimate the ideal interval between oil changes for your vehicle based on its total mileage and the … Routinely changing your vehicle’s oil is important to maintaining its overall health. While in the past, experts have recommended oil changes every 3,000 miles, thanks to advances in oil and engine technology, most vehicles can go 7,500 and 10,000 miles between oil changes. However, it’s always a great idea to check your owner’s manual ... Aug 31, 2013 · Charlotte, NC. I go about 5k between oil changes. I figure old school was 3k and manual says 7k, if I remember right. So 5k is a middle of the road. I think 3k was put in place by the oil companies and oil change stores. Engines, filters and oil have changed alot since the oil 3000 mile standard was set. Dec 26, 2013. Why is quality motor oil important? Read about the importance of quality motor oil at HowStuffWorks. Advertisement Changing your car's oil at regular intervals isn't just a good id...May 9, 2023 · Likewise, synthetic oil’s longer lifecycle versus conventional oil has also attracted many, with conventional oil requiring changes every 3,000-5,000 miles and synthetic every 7,500-15,000 miles. But today’s newer-tech engines often use synthetic-blend oil or full synthetic oil and are engineered to go anywhere from 7,500 to 15,000 miles between oil changes. Yes, synthetic oil changes ...16 Dec 2006 ... I recommend every 3000 miles so that my ExxonMobil stock will appreciate. In seriousness, my oil analysis indicates that conventional oil does ...How but this idea, use the M1 EP oils that allow for 15k mile/1 year oil changes, but then change it at 10-12k miles/1 year. Then I would feel fairly confident that I was not over-extending the oil change interval. +1 on the quality oil filter recommendation. Type of driving and engine type and condition are huge factors for oil change ...naskie18. 13051 posts · Joined 2003. #2 · Jun 15, 2006. I change the oil every 5000 miles...ish. Somewhere between 5000 and 7500 typically, depends how long it takes me to get free time. Right now, for example, I'm at about 6000 miles, and will probably go another 1000 before I get a chance to change it. Nick.However, you should continue to check the oil level regularly and top off if needed. Engines that recommend 5w-20 conventional oil, but allow the optional use of 0w-20 synthetic oil, as per the Owner's Manual, will continue to require 5,000-mile/6-month (whichever comes first) oil change intervals if the 0w-20 is used.I got my MM on my Hondas, and usually run it down to about 5%. On my 2017 Touring, I have had oil changes done at. --6,037 miles. --13,333 miles (7,296 on interval) I am at about 20,500 miles right now and taking it in tomorrow for it's 3rd oil change. 2017 Honda Pilot AWD Touring in steel sapphire metallic.Washington St. Jul 13, 2003. #3. There is no perfect, simple way to determine the correct oil change interval. Hours is used for industrial engines and vehicle engines that spend a lot of time not driving...cement mix trucks, crane trucks, etc. 150 hours is pretty short for this service, but it depends on the service and the engines.It is important to adhere to the manufacturer’s guidelines regarding oil change intervals. For the 2022 Hyundai Kona, it is generally recommended to have an oil change every 7,500 miles or every 12 months, whichever comes first. This interval has been determined by experts who understand the specific needs of your vehicle.Oct 27, 2014 · Bottom line....Toyota doesn't want you putting around in stop and go city traffic for 10k miles on conventional oil. If you have a 0w20 specd recommendation (which is always synthetic)....that's why they say you can use 5w20 but need to change it to 0w20 at the next change. Not all 5w20 is synthetic. 28 posts · Joined 2020. #17 · May 6, 2020. If you have the time go ahead and do the oil change as per owners manual. I doubt Subaru would contest 1 month over recommended oil change interval for warranty purposes during covid-19 time line. When I bought my 2012 Tacoma new Toyota stated 6 month or 5K per oil changes.The recommended interval for a Ford Focus oil change is every 3,000 to 5,000 miles if you use conventional oil. If you use synthetic oil, then the interval is between 7,500 and 10,000 miles. Synthetic blend oil will likely use an interval between those two. Check your manual for specifics on the type of oil.1). Sea Foam is made from 100% safe cleaning and lubricating ingredients. It can’t harm engine parts or components, no matter how long they’re in contact with Sea Foam. 2) That said, I’d recommend waiting until you are about 100-300 miles out from your next oil change before adding Sea Foam.Sep 29, 2012 · I don't see how there can be any warranty risk not following the oil change indicator recommendation unless you exceed 10,000 miles or 12 months between changes. So if the indicator comes on at 3,000 but you change it at 5,000 it should be all good. Well other than staring at that indicator for 2000 miles. Valvoline is one of the most trusted names in automotive care, and their oil changes are among the most popular services they offer. The basic cost for a Valvoline oil change is ty...If you change your oil every 3,000 religiously you could easily go 1-200 miles past the change, If you change your oil every 5,000 do what you have to do, but be gentle. If you are pushing the full 7,500 advertised on the jug of oil it's time to learn how to change your own oil stop putting it off. * (When I first started driving my car got an ...Sep 29, 2012 · I don't see how there can be any warranty risk not following the oil change indicator recommendation unless you exceed 10,000 miles or 12 months between changes. So if the indicator comes on at 3,000 but you change it at 5,000 it should be all good. Well other than staring at that indicator for 2000 miles. 1). Sea Foam is made from 100% safe cleaning and lubricating ingredients. It can’t harm engine parts or components, no matter how long they’re in contact with Sea Foam. 2) That said, I’d recommend waiting until you are about 100-300 miles out from your next oil change before adding Sea Foam. As far as how many miles between oil changes, we don't recommend changing your oil more frequently than every 3 months or 3,000 miles, unless otherwise specified by your vehicle’s manufacturer guidelines. Why do we recommend getting your oil changed no sooner than every 3 months or 3,000 miles? 2 Sept 2021 ... When you use Honda genuine parts and synthetic oil you can change every 7,500 miles. If you are not using synthetic oil you would need to change ...I prefer using Amsoil, 10W40. It is a quality synthetic oil. If you change oil every 3000 miles, and use synthetic, you are most likely changing it out too early, but, it is better than waiting too long. Conventional oil typically last 3000 miles, and synthetic is good for double that amount. Like.An oil change service doesn’t take long, but its results last for thousands of miles. And while the old rule of thumb was to change your oil every 3,000 miles or so, modern automotive technology has stretched that figure even further. Due to better engineering and better oil formulations, now you can expect between 7,500 to 10,000 miles ...Every 4-5K miles on engine (Full synthetic + Petron additive) Every 8-10K miles on Primary (Syn3) Every 16-20K miles on Transmission (Full synthetic + Petron additive) When I was running non-synthetic oil I changed every 2-3K miles. . Twin Cams and M8's, in stock condition, usually run the oil well over the 270* mark.Charlotte, NC. I go about 5k between oil changes. I figure old school was 3k and manual says 7k, if I remember right. So 5k is a middle of the road. I think 3k was put in place by the oil companies and oil change stores. Engines, filters and oil have changed alot since the oil 3000 mile standard was set. Dec 26, 2013.May 9, 2023 · Likewise, synthetic oil’s longer lifecycle versus conventional oil has also attracted many, with conventional oil requiring changes every 3,000-5,000 miles and synthetic every 7,500-15,000 miles. Aug 24, 2010 · Owners who change their oil themselves and are looking to extend the time between oil changes can safely switch to a 15,000-mile oil and make a lot fewer trips to the mechanic. They also should ... Different vehicles have different maintenance needs, especially with recent advances in automotive technology that have pushed some newer cars’ oil change …Engine: Northstar 4.6L V8 (LD8/L37) Posted October 13, 2007. I change the oil (5W30 synthetic local brand but meeting GM/Opel standard) according to the OLM, when it throws the "change oil soon" message at about 15% left. Usually that's after some 11,000 kms (7,000 mls). Oil is about three months in the engine by then.In most cases that means every 7,500 miles or six months, though some have stretched the oil-change interval to 10,000 miles, as with many Fords, Volkswagens and Toyotas. BMW allows up to 15,000 ...Cost me $95 for the oil change because my 2013 Sienna uses over 5 quarts. Now I have done some searching around to find out how long I should go before changing the oil again, and I cannot find a solid answer for this oil. I have seen everything suggested from 3,000 to 15,000 miles. I was just wanting to hear what other Sienna owners have …Normally, synthetic oil needs to be changed every 7,500 to 10,000 miles. For traditional oil, Nissan advises having your 2022 Nissan Rogue’s oil and filter replaced every 3,000-5,000 miles. Remember that the best way to determine the appropriate intervals for your automobile is to consult your owner’s manual and speak with your dealer.Jul 26, 2021 · Different vehicles have different maintenance needs, especially with recent advances in automotive technology that have pushed some newer cars’ oil change intervals out to 7,500 or 10,000 miles ... The standard oil change cycle on a Harley-Davidson is every 3000 miles. Oil changes usually depend on the riders preference as some owners may wait as long as 6 months before chang...The effort is appreciated, but its not clear Pope Francis's energy summit this weekend will make fossil fuel companies embrace the changes needed to save the world. Pope Francis ha...Charlotte, NC. I go about 5k between oil changes. I figure old school was 3k and manual says 7k, if I remember right. So 5k is a middle of the road. I think 3k was put in place by the oil companies and oil change stores. Engines, filters and oil have changed alot since the oil 3000 mile standard was set. Dec 26, 2013. How often should I change my oil? Many newer-model vehicles come equipped with an Intelligent Oil‐Life Monitor ® that determines when you should change the engine oil based on how your vehicle is used. This means you do not have to remember to change the oil on a mileage-based schedule. Your vehicle lets you know when an oil change is due by ... If you change your oil every 3,000 religiously you could easily go 1-200 miles past the change, If you change your oil every 5,000 do what you have to do, but be gentle. If you are pushing the full 7,500 advertised on the jug of oil it's time to learn how to change your own oil stop putting it off. * (When I first started driving my car got an ...If you're wondering when to change your oil, you're not alone. Our tire and auto service professionals recommend changing your vehicle’s motor oil on a pretty regular basis in order to maintain the life and longevity of your car. As far as how many miles between oil changes, we don't recommend changing your oil more frequently than every 3 ...have the differential fluid changed at 7,500 miles (12,000 km), then every 15,000 miles (24,000 km). *6: If a Maintenance Minder message does not appear more than 36 months after the display for item 7 is reset, change the brake fluid every 3 years. CODE Maintenance Sub Items 1 Rotate tires 2 Replace air cleaner element*25 Jul 2022 ... 4,000 miles between oil changes as per the Maintenance schedule. When changing it out the oil doesn't look new, but isn't completely past it's ...If your driving is generally pretty light, like commuting or taking the kids to school, plan on changing the oil every 7,500 to 10,000 miles. If you do some light towing every now and then, like to a tailgate or for working on the house, get an oil change every 5,000 to 8,000 miles. If your RAM really works hard towing lots of weight, or if you ...The old rule used to be every 3,000 miles for older cars but some now recommend every six months or 7,500+ miles between oil changes. So how do you know when it’s time for an oil change?Motor oil today is better than it was a decade ago, which has prompted many automakers to increase the intervals from 3,000 miles to 7,500 miles between changes. However, Toyota Motor Corp. has actually decreased the recommended intervals between oil changes, to ensure smooth running.Feb 20, 2023 · The oil in your Chevy Equinox should be changed every 5,000 to 7,500 miles. This will depend on the type of oil you use and the type of driving you do. If you use synthetic oil, you may be able to wait up to 10,000 miles between oil changes. However, if you do a lot of stop and go driving, you should stick to the 5,000 to 7,500 mile rule. 6 Nov 2017 ... If you uses full synthetic oil, you could go for 5k miles(or more). But most synthetic blend should be change out every 3k miles. OUBeaver's ...
Mobil 1 Extended Performance synthetic motor oil provides guaranteed engine protection up to 15,000 miles, according to the manufacturer. Other Mobil 1 products do not promise the .... Vegetarian meals delivered
Two months ago, the International Energy Agency sounded an alarm about global crude oil supply, predicting that Western sanctions on Russia would ... Two months ago, the Internatio...Earning points and miles, redeeming points and miles and elite status will change in 2021. Here's everything to expect in the new year. Update: Some offers mentioned below are no l...Bottom line: DO NOT run your 2.0 EB engine 7,500-10,000 miles between oil changes and DO NOT just rely on the dash display to tell you when to change the oil unless you plan to sell when the factory warranty is up. Otherwise, change your oil roughly every 5,000 miles with a high-quality, 100% synthetic oil and high-quality filter.naskie18. 13051 posts · Joined 2003. #2 · Jun 15, 2006. I change the oil every 5000 miles...ish. Somewhere between 5000 and 7500 typically, depends how long it takes me to get free time. Right now, for example, I'm at about 6000 miles, and will probably go another 1000 before I get a chance to change it. Nick.Jun 4, 2010 · aceracer24. 7500 miles depends on how you use your truck. It seems that on average, the truck will alert you to get an oil change around 3000 miles give or take and depending on how hard or easy you work your truck. The dealers are still pushing for 3000 mile oil changes but they are motivated by money. Advertisement You can change one fraction into another by one of three methods: Cracking takes large hydrocarbons and breaks them into smaller ones. Advertisement There are several...Many modern vehicles use synthetic motor oil, which only requires an oil change every 7,500–15,000 miles depending on the manufacturer’s recommendation. Read More. 3 Recalls for Cars Like Yours.8 Aug 2015 ... Every 3-5000 miles depending on how it has been driven and also what event is coming up. Example.... If I have 2500 miles on the oil and it is ...28 posts · Joined 2020. #17 · May 6, 2020. If you have the time go ahead and do the oil change as per owners manual. I doubt Subaru would contest 1 month over recommended oil change interval for warranty purposes during covid-19 time line. When I bought my 2012 Tacoma new Toyota stated 6 month or 5K per oil changes.The recommended interval for a Ford Focus oil change is every 3,000 to 5,000 miles if you use conventional oil. If you use synthetic oil, then the interval is between 7,500 and 10,000 miles. Synthetic blend oil will likely use an interval between those two. Check your manual for specifics on the type of oil.Mostly I put on e-way miles. Back home now for truck maintenance. My oil maint schedule #1 Change oil/filter & drive 10,000 miles. #2 Change filter, add a qt of oil & drive 10,000 miles. #3 Same as #2. #4 Same as #2. #5 Same as #2. #6 Same as #1. Thats 50K between oil drains. AMS Synthetic is NOT like Mobile 1, etc.Been averaging about 20,000 miles between oil changes and 5000 miles between oil filter changes. I do use synthetic. At 330,000 miles, my truck has not lost a beat. Changing out 12 quarts of oil every 3000 miles seems like a waste. I know, everyone says it relatively cheap insurance, but after studying oil reports and manufacturer ...Aug 24, 2010 · Owners who change their oil themselves and are looking to extend the time between oil changes can safely switch to a 15,000-mile oil and make a lot fewer trips to the mechanic. They also should ... According to my query：Honda recommends getting your 2016 Honda Odyssey oil & filter changed every 3,000-5,000 miles for conventional oil. Synthetic oil commonly should be changed every 7,500 - 10,000 miles. Like.May 7, 2011 · 1301 posts · Joined 2011. #2 · May 7, 2011. Now that the LML is using 9th injector after turbo for regen (no more oil dilutuion from previous regen done in cylinder on exhaust stroke,YAY) you can go 8000 miles between oil changes without a problem. 2015 SLT CCSB Summit White on Jet Black sunroof/rear slider/driver alert/ cooled/heated leather ... .
Popular Topics
- Tator tots near meIs seaworld still open
- Benefits of being a teacherWest elm oliver sofa
- West indies vs australiaAnimal crossing new horizons villagers
- New super mario bros uSpider man remastered ps5
- Where can i watch yellowstoneLearning in german
- Types of underwear for menAnswering service for small business
- Pimsleur reviewGcc c compiler