I pulled this report off of NASIOC. Left column is last result for 3500mi. The right column is the last interval, between 3000-3500mi. Total 17500mi on the engine. Lead is abnormally high for a WRX engine, not sure what to think of it. Car is stock. ? marks unknown data. What could be causing the high lead? Usually high lead points to detonation or oil starvation, but this would usually occur on a modified or raced engine, of which this is neither.
M1 5w30 3500mi Subaru WRX 2.0t
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Chris B.: "This looks like the worst WRX UOA ever! Check out that lead!"
Exactly! We normally get amazing results from these engines ... with just about every brand of oil.
--- Bror Jace
Exactly! We normally get amazing results from these engines ... with just about every brand of oil.
--- Bror Jace
Hmmmmm.....that report does not look all that bad. He may auto-x this car and/or drag race it. I'm willing to be a cold Pepsi this guys ran leaded fuel for quite a while and contaminated the oil big time. Just a thought!
The oil chemistry sure as heck looks like M1, most likely 5 or 10W-30. Very hard to figure some stuff out when we have such limited data here. In any case, I too would try a very thick 30W or a 40W.
Rick
The oil chemistry sure as heck looks like M1, most likely 5 or 10W-30. Very hard to figure some stuff out when we have such limited data here. In any case, I too would try a very thick 30W or a 40W.
Rick
This is my analysis...
Please let me know what other info I can provide.
This car is not autocrossed and I have never intentionally put leaded gas in it...always exxon or amoco super unleaded.
oil is mobil 1 and after this weekend we are trying 15w50. before it was 5w30
Please let me know what other info I can provide.
This car is not autocrossed and I have never intentionally put leaded gas in it...always exxon or amoco super unleaded.
oil is mobil 1 and after this weekend we are trying 15w50. before it was 5w30
Thoise Subie engines are awesome - even my lowly Outback beater has 100k miles on it and never burns oil, even with 5/10w30 syn.
The WRX has a short (10" or so) crank with a zillion bolts retaining it, so it hardly moves at all. Fuji Heavy Industries designs and builds outstanding engines.
I think the WRX's will have amazing longevity for turbo'd cars, and driven hard as well.
The WRX has a short (10" or so) crank with a zillion bolts retaining it, so it hardly moves at all. Fuji Heavy Industries designs and builds outstanding engines.
I think the WRX's will have amazing longevity for turbo'd cars, and driven hard as well.
YIKES!!! I guess I just lost a cold Pepsi, huh? Anyway....darn, that is a lot of lead, and the other metals, although not alarmingly high, aren't that great since you state you don't race the car or anything. I wonder if there has been some permanent damage already done to the bearings as a result of your last and previous intervals. I give the 15W-50 the thumbs up, but I'm a bit skeptical it would completely cure the lead problem.
Good luck!
EDIT: I would test that 15W-50 after just 2k miles, just to see what's shaking with the lead. No need to drain all the oil.....just enough for the test.
[ April 15, 2004, 11:52 PM: Message edited by: Last_Z ]
Are you using a gas additive or octain bosster which could affect the analysis? eddie
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