what oil and how often
31 March 2005 | 08:52 PM
#1
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Scooby Regular
Joined: Sep 2004
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From: teesside
what oil and how often
i have an my02 wrx, i am in a right puzzle over what oil to use, the book says 5-30 semi synthetic, how ever after asking various specialist they all advise something like: motul 15 - 50 fully synth, silkolene 15- 50 fully synth, mobil motosport 15 - 50 fully synth, but on the other hand i have asked various main dealers and familly run subaru specialist and they have admitted (all of them i asked) that they have tried fully synthetic oils in there cars and the results were not good, noisey rattling knocking engines, just wondering if you guys n girls can let me know what oil you using and how often changed and any experiences good bad or indifferent, cheers
31 March 2005 | 09:50 PM
#2
Scooby Regular
Joined: Nov 2003
Posts: 617
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From: MY02 WRX w/ Ver8 STi engine & 6MT
Oil FAQ from NASIOC
What is the best oil? Simply put, there is no best oil.
What type and amount of oil should I use? Refer to and use what your vehicle owner's manual requires for your vehicle and engine type. Special Note to Forester and STi owners: The amount listed in your owner's manual is incorrect. The corrected amount can be found via this link.
How do I check my oil? The oil should be checked warm. This means your engine has been run enough for the coolant temp level to be normal. The best spot for checking is during fill ups as most gas stations have 100% flat surfaces at the pumps. The distance between the holes equals 1 quart. If the oil level is in the middle of the holes, it is properly filled. The bottom hole equates to 1/2 quart low and the top hole equates to 1/2 quart too full.
Since I live in Alaska, should my oil weight be different than someone who lives in Phoenix? This is a hotly debated topic since motor oil weights are "designed" for different temperature ratings. There are many oil weight charts that show which weights are "best" for which temperature extremes. The American Petroleum Institute, Society of American Engineers, and nearly every oil manufacturer state plainly that you should use what your owner's manual recommends. API Motor Oil Guide (.pdf document). If your vehicle is used in desert areas with very high temperatures or for other heavy duty applications, the following viscosity oils may be used: API classification: SL or SJ. ILSAC classification: GF-3. SAE Viscosity No.: 30, 40, 10W-50, 20W-40, 20W-50.
How often should I change my oil? Refer to and use the maintenance schedule in your owner's manual.
Why do some companies or even my dealer always recommend an oil change every 3000 miles? The more often you change it, the more money they make.
What do independent companies say with regard to oil changes and frequency? Consumer Reports tested 20 motor oils over 22 months on New York City Taxicabs. Their results basically stated to use the oil recommend and the change frequency schedule stated in your owner's manual. The full article may be read via this link.
Is it bad to change my oil more often than the owner's manual states? Changing your oil more frequently than required has no negative aspects other than increased maintenance costs.
My car has a turbo, isn't synthetic the best bet for turbos? Subaru turbos are cooled by oil and coolant using a convection system, with coolant handling the cooling needs once the engine is turned off. Older turbo cooling technology relied solely upon oil cooling and synthetics are probably a better bet for those systems.
If I want to use synthetic, when should I switch? This is a hotly debated topic and you will find many convincing arguments for waiting a certain amount of miles or oil change cycles. There is no evidence that one particular time is best, so switch to synthetic when you feel is best, be it at 10,000 miles or 10 miles.
My car has XX,000 miles on it, can I switch over to synthetic? Yes. Some recommend an engine oil flush prior to the synthetic conversion. An engine flush is usually a very thin oil designed to remove old oil deposits. There are many convincing arguments as to whether this step is required or not. Arguably the best engine flush treatment is Auto-RX.
What types of motor oil are available? There are three main types:
1. Plain oil AKA mineral based oil or dino oil
2. Synthetic
3. Blends which are a combination of synthetic and dino oil
Are there different types of synthetic? Yes.
1. Group III is a highly processed dino oil.
2. Group IV is PAO (polyalphaolefin) based oil.
3. Group V is an esther or polyolester based oil.
Which companies make quality synthetic motor oils? Some of the more popular manufacturers are:
Red Line
Mobil 1
Motul
Neo
Royal Purple
Amsoil
How do I know what my synthetic or dino oil actually contains? Most motor oil manufacturers have .pdf or html documents listed on their website that contain physical property data and/or MSDS sheets that go over which basestock group it is, additives, and other information about their oils.
Are synthetic blends a good compromise? Yes and no. With commercially available synthetic blends, you have no idea of what the synthetic to dino oil ratio is. One would assume it would be 50/50, but it could just as easily be 10/90. A better and more economical compromise would be to mix your own using a quality dino oil with a quality synthetic. This is an undertaking for more advanced users and should be performed only after careful research.
What about extended oil changes when using synthetics? Extended drain intervals are possible with synthetic oils. To find out at what interval your oil needs to be changed, you need to institute a system of oil analysis. Blackstone Labs provides analysis services to help you determine your oil change interval. Keep in mind that even with synthetics, the oil change interval still should be the same according to the owner's manual. Use of extended oil changes through oil analysis should only be attempted by advanced users, and only after careful research.
What is the best oil filter? Simply put, there is no best oil filter. Popular opinion says the "top filters" are the OEM filter, Mobile 1 filter, and Purolator One filter. For further oil filter information, examine these oil filter studies:
a. bobistheoilguy.com oil filter study
b. Russ Knize oil filter study
c. Oil filter study
d. NTPOG Oil Filter Review
e. Engine Oil Filter Study
f. Armand's Subaru Oil Filter Study
g. RX-7 Oil Filter Study
These studies, though not all Subaru specific, outline the general characteristics of oil filters for comparison purposes. If you use a Subaru OEM filter, there has been a recent and important change to the part numbers that might be applicable to your model. Refer to this thread for details. Good overall oil filter information.
How do I change my own oil? All the necessary tools, tips, tricks, and other oil change related advice can be found by visiting these links:
Scoobymods.com instructions for the Forester.
Scoobymods.com instructions for the Impreza
Scoobymods.com instructions for the Fumoto Oil Drain Valve
Even if your car model is not listed above, these links provide excellent applicable advice for your particular model.
What about engine oil additives such as Slick 50, Duralube, STP, Prolong, etc.? You would be hard pressed to find an engine oil additive manufacturer that hasn't been successfully sued by the Federal Trade Commission. There are also several motorsports and consumer magazines that speak against adding anything to your oil. Here are some articles about engine oil additives:
Article by Chris Longhurst
Consumer Reports article
Snake Oil!
What about magnetic drain plugs or magnets for your oil filter? An oil filter has the ability to filter objects smaller than the human eye can see. If you use a magnetic drain plug, magnets on the bottom of your oil pan, or magnetic devices on your oil filter, they do work, however, they are only holding particles that would normally end up in your oil filter anyway. There is no harm in these devices, however they provide no additional protection.
Any other good articles on oil? These articles may provide additional helpful information:
Engine Oil Bible
The Oil FAQ
Where can I find more information about oil, oil filters, and other oil related information? bobistheoilguy.com's forum is the best source for this type of information. The folks on that forum eat, drink, and sleep oil information. Obviously there is good advice meeted out on NASIOC, but the folks on BITOG back their advice up with hard data and facts rather than personal impressions.
Me personally, I use Mobil 1 5w30 and change the oil every 5k miles. Now that they are selling Royal Purple (real synthetic oil not carbon breaking) here, I will be using that instead and changing the oil at 7,500 like my owners manual says to.
What is the best oil? Simply put, there is no best oil.
What type and amount of oil should I use? Refer to and use what your vehicle owner's manual requires for your vehicle and engine type. Special Note to Forester and STi owners: The amount listed in your owner's manual is incorrect. The corrected amount can be found via this link.
How do I check my oil? The oil should be checked warm. This means your engine has been run enough for the coolant temp level to be normal. The best spot for checking is during fill ups as most gas stations have 100% flat surfaces at the pumps. The distance between the holes equals 1 quart. If the oil level is in the middle of the holes, it is properly filled. The bottom hole equates to 1/2 quart low and the top hole equates to 1/2 quart too full.
Since I live in Alaska, should my oil weight be different than someone who lives in Phoenix? This is a hotly debated topic since motor oil weights are "designed" for different temperature ratings. There are many oil weight charts that show which weights are "best" for which temperature extremes. The American Petroleum Institute, Society of American Engineers, and nearly every oil manufacturer state plainly that you should use what your owner's manual recommends. API Motor Oil Guide (.pdf document). If your vehicle is used in desert areas with very high temperatures or for other heavy duty applications, the following viscosity oils may be used: API classification: SL or SJ. ILSAC classification: GF-3. SAE Viscosity No.: 30, 40, 10W-50, 20W-40, 20W-50.
How often should I change my oil? Refer to and use the maintenance schedule in your owner's manual.
Why do some companies or even my dealer always recommend an oil change every 3000 miles? The more often you change it, the more money they make.
What do independent companies say with regard to oil changes and frequency? Consumer Reports tested 20 motor oils over 22 months on New York City Taxicabs. Their results basically stated to use the oil recommend and the change frequency schedule stated in your owner's manual. The full article may be read via this link.
Is it bad to change my oil more often than the owner's manual states? Changing your oil more frequently than required has no negative aspects other than increased maintenance costs.
My car has a turbo, isn't synthetic the best bet for turbos? Subaru turbos are cooled by oil and coolant using a convection system, with coolant handling the cooling needs once the engine is turned off. Older turbo cooling technology relied solely upon oil cooling and synthetics are probably a better bet for those systems.
If I want to use synthetic, when should I switch? This is a hotly debated topic and you will find many convincing arguments for waiting a certain amount of miles or oil change cycles. There is no evidence that one particular time is best, so switch to synthetic when you feel is best, be it at 10,000 miles or 10 miles.
My car has XX,000 miles on it, can I switch over to synthetic? Yes. Some recommend an engine oil flush prior to the synthetic conversion. An engine flush is usually a very thin oil designed to remove old oil deposits. There are many convincing arguments as to whether this step is required or not. Arguably the best engine flush treatment is Auto-RX.
What types of motor oil are available? There are three main types:
1. Plain oil AKA mineral based oil or dino oil
2. Synthetic
3. Blends which are a combination of synthetic and dino oil
Are there different types of synthetic? Yes.
1. Group III is a highly processed dino oil.
2. Group IV is PAO (polyalphaolefin) based oil.
3. Group V is an esther or polyolester based oil.
Which companies make quality synthetic motor oils? Some of the more popular manufacturers are:
Red Line
Mobil 1
Motul
Neo
Royal Purple
Amsoil
How do I know what my synthetic or dino oil actually contains? Most motor oil manufacturers have .pdf or html documents listed on their website that contain physical property data and/or MSDS sheets that go over which basestock group it is, additives, and other information about their oils.
Are synthetic blends a good compromise? Yes and no. With commercially available synthetic blends, you have no idea of what the synthetic to dino oil ratio is. One would assume it would be 50/50, but it could just as easily be 10/90. A better and more economical compromise would be to mix your own using a quality dino oil with a quality synthetic. This is an undertaking for more advanced users and should be performed only after careful research.
What about extended oil changes when using synthetics? Extended drain intervals are possible with synthetic oils. To find out at what interval your oil needs to be changed, you need to institute a system of oil analysis. Blackstone Labs provides analysis services to help you determine your oil change interval. Keep in mind that even with synthetics, the oil change interval still should be the same according to the owner's manual. Use of extended oil changes through oil analysis should only be attempted by advanced users, and only after careful research.
What is the best oil filter? Simply put, there is no best oil filter. Popular opinion says the "top filters" are the OEM filter, Mobile 1 filter, and Purolator One filter. For further oil filter information, examine these oil filter studies:
a. bobistheoilguy.com oil filter study
b. Russ Knize oil filter study
c. Oil filter study
d. NTPOG Oil Filter Review
e. Engine Oil Filter Study
f. Armand's Subaru Oil Filter Study
g. RX-7 Oil Filter Study
These studies, though not all Subaru specific, outline the general characteristics of oil filters for comparison purposes. If you use a Subaru OEM filter, there has been a recent and important change to the part numbers that might be applicable to your model. Refer to this thread for details. Good overall oil filter information.
How do I change my own oil? All the necessary tools, tips, tricks, and other oil change related advice can be found by visiting these links:
Scoobymods.com instructions for the Forester.
Scoobymods.com instructions for the Impreza
Scoobymods.com instructions for the Fumoto Oil Drain Valve
Even if your car model is not listed above, these links provide excellent applicable advice for your particular model.
What about engine oil additives such as Slick 50, Duralube, STP, Prolong, etc.? You would be hard pressed to find an engine oil additive manufacturer that hasn't been successfully sued by the Federal Trade Commission. There are also several motorsports and consumer magazines that speak against adding anything to your oil. Here are some articles about engine oil additives:
Article by Chris Longhurst
Consumer Reports article
Snake Oil!
What about magnetic drain plugs or magnets for your oil filter? An oil filter has the ability to filter objects smaller than the human eye can see. If you use a magnetic drain plug, magnets on the bottom of your oil pan, or magnetic devices on your oil filter, they do work, however, they are only holding particles that would normally end up in your oil filter anyway. There is no harm in these devices, however they provide no additional protection.
Any other good articles on oil? These articles may provide additional helpful information:
Engine Oil Bible
The Oil FAQ
Where can I find more information about oil, oil filters, and other oil related information? bobistheoilguy.com's forum is the best source for this type of information. The folks on that forum eat, drink, and sleep oil information. Obviously there is good advice meeted out on NASIOC, but the folks on BITOG back their advice up with hard data and facts rather than personal impressions.
Me personally, I use Mobil 1 5w30 and change the oil every 5k miles. Now that they are selling Royal Purple (real synthetic oil not carbon breaking) here, I will be using that instead and changing the oil at 7,500 like my owners manual says to.
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