please help - Subaru WRX Forum
 
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post #1 of 13 Old 11-27-2009, 04:01 PM Thread Starter
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please help

just wondering can i put 15w-40 conventional oil in my 2002 wrx?
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post #2 of 13 Old 11-27-2009, 04:42 PM
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10w-40 is somewhat common, but 15w is a bit high. Why do you want to do this?
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post #3 of 13 Old 11-27-2009, 05:27 PM Thread Starter
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it is the only oil i can get my hands on and im just running it for about 1000K just to flush the sludge out.
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post #4 of 13 Old 11-28-2009, 01:22 AM
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Quote:
Originally Posted by HOCKEYSCOOB2 View Post
it is the only oil i can get my hands on and im just running it for about 1000K just to flush the sludge out.
Do you mean that's the oil you currently have and it would be convenient for you to use it or that's the only oil that's sold at every single retailer within a reasonable driving ditance of your residence? The manual recommends 5W30, so that's what I'd recommend too. I personally use Royal Purple 5W30 and change it every 3,000 miles. I wouldn't think you'd have too much sludge built up if you change your oil regularly. Remember, your oil is partly used to lubricate/cool your turbo so you don't want to deviate too far from the factory recommended weight.

John
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post #5 of 13 Old 11-28-2009, 05:24 PM
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use 5w-30 synthetic...................dont blow up your car
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post #6 of 13 Old 11-28-2009, 06:59 PM
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I run 10W-30 in mine year round. I wouldnt go any higher or lower though. Gastrol GTX all the way, if you can get it that is.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
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Last edited by newtothegame; 11-29-2009 at 12:23 AM.
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post #7 of 13 Old 11-28-2009, 09:54 PM
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15w-40 is diesel engine oil, pretty heavy (thick) stuff
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post #8 of 13 Old 11-29-2009, 11:54 AM
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Its still a matter of flow. You want it to flow properly to cool/lubricate the parts properly. I run AMSoil 5w-30 100% syn high performance. Its costly, but it has zinc and goodies in it that help the bearings.

Kirt
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"When in doubt...flat out" - Colin McRae
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post #9 of 13 Old 11-29-2009, 07:26 PM
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I remember reading somewhere that the most abuse your engine takes is upon initial startup when it's cold. Granted, there may be other situations where much more abuse is issued - like redlining the engine for a period of time, running it with an extremely low amount or without any oil, running it with extremely dirty oil that has never been changed, etc... but seriously, when you start a cold engine (one that's been sitting for a period of time - a few days, overnight, a few hours, etc.), you want the oil to be able to lubricate all the moving parts immediately as well as continue to lubricate everything adequately once it gets up to operating temperature and not break down or become too thin. If you use an oil that's too thick, it won't be able to adequately lubricate all the parts until it warms up, so during that whole period of time before that happens, parts will be grinding and sustaining unnecessary wear. That's why Subaru recommends 5w30 since they found it to be adequate for most climates across the country. Some people (I believe in warmer climates) use 10w30 and that's probably fine.

Also, here's some information about synthetics for those who may be interested:

There are several types of sythetic oils on the market and the base stock is what differentates them.

The best base stock is polyol-ester (Redline & Motul)

Next best is di-ester (Royal Purple, Amsoil, Neo)

Next is polyolefin polyamine (Mobil 1)

Next is Hydrocracked (Syntec, Valvoline)

And finally regular dyno oils

John
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post #10 of 13 Old 11-30-2009, 08:46 AM
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Awww I'm only running third best...
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post #11 of 13 Old 12-01-2009, 01:28 AM
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Man show: Where did you find that info? Just curious.

Kirt
378awhp/373wtq Custom Dom 3 & CBRD tuned 2006 STI.
"When in doubt...flat out" - Colin McRae
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post #12 of 13 Old 12-01-2009, 01:49 AM
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Can't remember exactly... I think I found it in one of the other forums when I was searching for something else and it sounded pretty legit to me so i copied it and kept it for just such an occasion.

John
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post #13 of 13 Old 12-02-2009, 08:12 PM
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Quote:
Originally Posted by C89ZX7R View Post
Mobil 1 is trash!
That has to be one of the most intelligent posts I have ever seen. Instead of just blurting something out, back it up. If you dont like it fine, so be it, if it really isnt any good, back it up with some links, some date, maybe personal experience.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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