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Old 04-28-2005, 08:04 PM   #1
realwomble
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Default Oil analysis, 02 WRX, 7.5k M1 5-30.

http://theoildrop.server101.com/ubb/...c;f=3;t=002525

It's pretty bad. Suggestions appreciated.
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Last edited by realwomble; 04-28-2005 at 08:15 PM.
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Old 04-28-2005, 08:28 PM   #2
OneOBS
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Its not that bad and its your first fully synthetic oil. You may have picked up some residual stuff that was hanging out in the engine. Was the oil changed when it was warm or hot? Has it been changed that way in the past? If the dealer changed it, maybe not. Cars tend to sit in the lot for awhile and cool off before they get around to working on them. I think an analysis after your next oil change will tell you a lot more.
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Old 04-28-2005, 08:37 PM   #3
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Hmm.

When I put that oil in (first change I did myself), the car was cold.

When I changed it out this time, it was hot (shoots out faster / further that way... as I discovered )

Maybe I'll take some oil out for analysis after 4k after re-checking air filter and IC hoses.

Thanks.
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Old 04-28-2005, 08:58 PM   #4
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Hot oil holds more contaminents in suspension. That may be your answer right there.
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Old 04-28-2005, 09:32 PM   #5
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My personal feeling is 7500 miles even with synthetic is too long to go with a turbo engine. I'd stick to no more than 4K to be on the safe side. 6K if you really baby it and do a lot of hwy miles. Also, the Mobil 10W30 shows better oil analysis results over on BITOG.com than the 5W30.
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Old 04-29-2005, 02:52 AM   #6
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I think the short 8 mile trips are the reason for the "relatively" bad results compared to other UOA reports. The other WRXes with better 7500 mile UOA reports all have longer commutes. With 8 mile short trips maybe 5000 mile oil change interval is more suitable, if you want to get reports as good as others. Nothing really wrong with your report though, just not as good as others.
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Old 04-29-2005, 01:33 PM   #7
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Quote:
Originally Posted by rexaroo
My personal feeling is 7500 miles even with synthetic is too long to go with a turbo engine. I'd stick to no more than 4K to be on the safe side. 6K if you really baby it and do a lot of hwy miles. Also, the Mobil 10W30 shows better oil analysis results over on BITOG.com than the 5W30.
It's probably too long on M1 5W30.
I posted some of my UOA links for comparison over on BITOG since I take short trips weekdays as well. My Si is probably high due to the Amsoil air filter (and wearing in) and an OEM filter went in at the last OC.

-Dennis
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Old 04-29-2005, 02:52 PM   #8
realwomble
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Did you have high wear metals as well?

(edit)

Just checked them out. Your Si is comparable to mine, but your lead is still very low. My lead (bearings?) is sky high....

Last edited by realwomble; 04-29-2005 at 03:03 PM.
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Old 04-29-2005, 02:59 PM   #9
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Comments from TooSlick over at BITOG below.

Any suggestions where to check for vaccum leaks, other than IC hoses?

The Cr and Al levels are fine and there is no nickel present which would indicate valve stem wear. I'd say you are ingesting silicon particles directly into the crankcase through a vacuum leak, and some of these are larger than your bearing clearances. This is the cause of your elevated valve train and bearing wear.

A wear rate for Fe of > 3 ppm/1000 miles is abnormal for any 2.0L engine that uses a timing belt and not a lubricated chain. Bearing wear is also at least twice as high as it should be....

I'd suggest running a 5w-40/10w-40 with a HT/HS viscosity of at least 4.0 Cp, until you get this problem resolved. The thicker oil will keep you from getting into a boundary lubrication situation so often.

When you have high levels of abrasives (dirt/soot) present you want to avoid having to depend on AW additives. The integrity of these very thin, AW films will be severely degraded by hard abrasive particles....

Last edited by realwomble; 04-30-2005 at 01:17 AM.
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Old 04-30-2005, 03:07 PM   #10
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How critical is it to sample the "middle" part of the drain? I know the reasoning behind it, but I'm curious how much taking the first or last oil out of the engine will affect the readings.
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