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Old 03-25-2008, 08:14 PM   #1
STIFLYBY_RANGER
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Default 15w-40? help me understand

a tuner i was talking to advised me to remove the restrictor pill and use 15w-4o oil .. on my 30 .82 2006 sti , bad info or not too bad what will come of it.? i mean thats a thick ass oil!
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Old 03-25-2008, 08:30 PM   #2
JamesWilson
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Not really all that "thick". Subaru actually recommends those weights for certain models and applications. Do a search, tons of people using 15w-40 and 15w-50 weights for their cars here.

-JamesW
5w-40 weight, non-turbo.
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Old 03-25-2008, 10:01 PM   #3
STIFLYBY_RANGER
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well what bad things can come from going from 5w-30 to the new weight
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Old 03-25-2008, 10:20 PM   #4
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In very cold weather, it is too thick and will not provide lubrication as fast as any 5W whatever oil. I think there are a few good UOA's from WRX owners using 15W40 here, shell rotellaT?
Your tuner sounds like the kinda guy who has weird ideas stuck in his head.

If you really want info on oil, much better then you will get here, educate yourself on the link. www.bobistheoilguy.com
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Old 03-25-2008, 10:23 PM   #5
STIFLYBY_RANGER
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will do , im just not used to making a jump like that, and it not having a negative effect
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Old 03-25-2008, 10:43 PM   #6
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shell rotella-t 15w40 is good oil. A lot of built motor folks use it. Do you have a stock engine or a built motor with looser tolerences?

I don't understand why he recommended to remove the restrictor pill? I assume you mean the one on the turbo oil feed line, why remove that?
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Old 03-25-2008, 11:03 PM   #7
STIFLYBY_RANGER
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stock internals, aftermarket everything else possible ... i guess he was afraid to choke it of oil, but i was just afraid it may cause some issue. i noticed smoke today which has never happened so i think itd be smart to reinstall the pill for the feed line and the oil im using is royal purple
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Old 03-25-2008, 11:44 PM   #8
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I use amsoil 20-50 racing oil year'round[5-112 degrees] in 06, stage 3 which I drive hard.It uses 0 oil between changes. Better safe than sorry.
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Old 03-26-2008, 12:13 AM   #9
STIFLYBY_RANGER
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so i really dont need to worry about the weight i have in just possibly using the restictor. like i said the internals are stock. but thats all and ive got alot of boost 27 lbs worth.

Last edited by STIFLYBY_RANGER; 03-26-2008 at 12:22 AM.
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Old 03-26-2008, 12:19 AM   #10
moosecakes
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http://store.forcedperformance.net/m...Info_SubaruOil
Everyone in this thread should read that!

Personally im using 5w50 on a stage 2 setup with very good results.
15w40 would be great for a built motor!
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Old 03-26-2008, 12:28 AM   #11
STIFLYBY_RANGER
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yea well as i stated not built motor yet.. just everything else you can think of and a lot of boost .. no restrictor anymore and that oil weight
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Old 03-26-2008, 12:29 AM   #12
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Quote:
Originally Posted by STIFLYBY_RANGER View Post
will do , im just not used to making a jump like that, and it not having a negative effect
your engine doesn't know, care, or remember what the previous batch of oil was compared to your current fill. it is ok to go from 5-30 to 15-50 if you want.

the ONLY exception was waaaay back, 10-15+ years ago, regular oil would cause some seals to swell. if you went to synth after the seals had hit their critical size, the engine would weep oil since the synth wouldn't swell the seals and they returned to their original size. (minus the wear that occurred, aka the new leak)
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Old 03-26-2008, 11:10 PM   #13
STIFLYBY_RANGER
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and what about the restrictor pill, does anybody choose not to use it at all, i always had it in, perrin also supplies 2 just in case
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