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Old 06-12-2009, 10:20 PM   #1
Magnum626
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Join Date: May 2004
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Question Inconsistent or sporadic oil loss?

I'm hoping you guys can give me an explanation. When I had Castrol 10w40 and reached around 1200 miles I would have no oil loss but around 1300-1500 I would be down maybe 3/4 of a quart. Sometimes this happens even before I hit 1000 or sometimes i'll have oil loss only after 1800 miles.

On my last oil change I switched to GC and I had no oil loss until around around the 1200 mile mark and that was about half a quart, meanwhile around 70 miles before that there was no oil loss at all.

Any reason why I would have sudden loss of oil like that? And it's not always around the same mileage.

I have no leaks, no oil on the engine. Turbo seals going bad? PCV valve? I've had an oil catch can for over a year and it's bone dry.

Stage 2, 92k, Cobb AP V1. Daily driver with short mileage to work, about 12 miles back and forth. I do some spirited driving after work sometimes.
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Old 06-13-2009, 12:24 AM   #2
williaty
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Mine does that too. It's all about the RPM and manifold vacuum. High RPM, high manifold vacuum will suck oil through the PCV and burn it off like a mofo.
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Old 06-13-2009, 01:47 AM   #3
Magnum626
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So I guess the random spirited driving, throttle let off after going WOT will pull the oil through?

Maybe I'll pay more attention to my spirited driving events and see if there's a correlation.

But can a bad PCV also affect it? I've never changed mine.
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Old 06-13-2009, 02:57 AM   #4
Uncle Scotty
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Quote:
Originally Posted by Magnum626 View Post
So I guess the random spirited driving, throttle let off after going WOT will pull the oil through?

Maybe I'll pay more attention to my spirited driving events and see if there's a correlation.

But can a bad PCV also affect it? I've never changed mine.
change it.......get an OEM one from the dealer
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Old 06-13-2009, 12:25 PM   #5
esteve
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Do you check your oil level consistently at the same time? I've never owned a car that's given me so much freakin' trouble to check the oil level as my WRX.

It seems like I get the most consistent readings when I wait a few minutes after shutting off the motor after it's nice and hot.

Several months ago, for some reason I checked the level when the motor was cold. The dipstick didn't have a drop of oil on it, and after nearly crapping in my pants I drove my car to a Kragen a few blocks away. I put in a full quart of M1 TDT 5W-40, drove back to work and checked the level again. This time, the damn level was a little past the upper notch for expansion! I could only scratch my head at that one.
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