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Old 06-21-2005, 10:20 AM   #1
essogas
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2004 WRX STi
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Default 15W 50 Mobil 1 too heavy for Sti

I was thinking of switching to a heavier grade because my car eats oil (no leaking) too 15W 50. Tuner suggested it, but dealership warned against it. Opinions?
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Old 06-21-2005, 10:55 AM   #2
rbahr
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It is what I run in the summer in the NE area - but I do track the car a fair ammount so I think I need it. In the winter I run 0-40W

Ray
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Old 06-21-2005, 11:56 AM   #3
Rdrcr
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There is not a lot of cold start-up protection with a 15w 50 oil.

Mike
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Old 06-21-2005, 12:33 PM   #4
turbo2ner
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Too thick bro. Your bearing clearence is what detemines the oil weight you should use. Unless you have had a motor built for that weight oil with a looser build then forget it. Maybe your motor is high milage, in that case your motor is now "loose". And a thicker oil should be used to restore the proper oil pressure. The thinner the oil, the more power. But you have to work with your engine builder on the over all plan for your application. Many different reasons for going one way or the other.
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Old 06-21-2005, 01:12 PM   #5
GreenEJ25
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I just got Motul 10w 40 and I drive in an extremely hot area. I was under the impression that because the oil is heavier it is more resistant to heat break down so I went with a little heavier oil for more protection. I'm probably an idiot though.
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Old 06-21-2005, 01:48 PM   #6
AaronWRX
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Quote:
Originally Posted by GreenEJ25
I just got Motul 10w 40 and I drive in an extremely hot area. I was under the impression that because the oil is heavier it is more resistant to heat break down so I went with a little heavier oil for more protection. I'm probably an idiot though.
^^ i switched to German Castrol 0w30 for the summer!

it's holding up FAR better then mobile 1 5w30
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Old 06-22-2005, 04:21 AM   #7
malibuda
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here in the EU everybody uses 10w40 or 15w50
if you check out EU forums scoobynet(uk) nobody uses 0/5w30
i think that is the reason for useing to much oil
2 years and not a drop of oil i am useing motul v300 15w50 in the winter 10w40
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Old 06-22-2005, 07:03 AM   #8
turbo2ner
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So everybody ignores the owners manual, and common sense, and just put in whatever they feel is the best? Sounds good. Maybe try talking to a machine shop, or motor builder. See what they say.
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Old 06-22-2005, 08:51 AM   #9
AndyH
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Quote:
Originally Posted by turbo2ner
So everybody ignores the owners manual, and common sense, and just put in whatever they feel is the best? Sounds good. Maybe try talking to a machine shop, or motor builder. See what they say.
I don't know about your Owner's Manual, but my '05 STi manual mentions several different oil grades as being acceptable depending on ambient temps and how "hard" the car is used.

For the original poster: Try Mobil-1 5w-40, should work well in your STi.
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Old 06-22-2005, 09:15 AM   #10
bluesubie
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Quote:
Originally Posted by AndyH
I don't know about your Owner's Manual, but my '05 STi manual mentions several different oil grades as being acceptable depending on ambient temps and how "hard" the car is used.
Apparently everyone just looks at the oil cap instead of RTFM.

essogas - 15W50 might be too thick for Canada and your needs. If you're trying to stop your car from using oil, increase the thickness gradually IMO (0W40, 5W40). Keep in mind that you still might use oil for the first few thousand miles if you switch brands.

-Dennis
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Old 06-22-2005, 10:18 AM   #11
rbahr
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The owners manual does NOT include operating the car at a race track or supporting sustained oil temps of >250 deg F. Oil like gas is one of those subject matters that is surrounded by lore and urban legend.

A site that I like is http://www.bobistheoilguy.com/ for information. In addition Mobil, Redline and others are a good source of real information.

Ray
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Old 06-22-2005, 12:27 PM   #12
Uncle Scotty
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....the ONLY reason that 5w30 is 'recommended' is for CAFE....it saves a bit of gas........NOT because it is 'good' to use or good for the engine in any way.

There are a LOT of myths in this community and the 5w30 one is one of the most idiotic out there.....
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Old 06-22-2005, 03:18 PM   #13
AaronWRX
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Quote:
Originally Posted by turbo2ner
So everybody ignores the owners manual, and common sense, and just put in whatever they feel is the best? Sounds good. Maybe try talking to a machine shop, or motor builder. See what they say.

I put GC 0w30 in my car because it's green, and it's made my little green elves.... not just because it felt right. sheesh!
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Old 06-23-2005, 09:33 AM   #14
bluesubie
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Quote:
Originally Posted by AaronWRX

I put GC 0w30 in my car because it's green
Not for long.

-Dennis
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