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Old 07-24-2009, 12:27 AM   #1
2001stook
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Member#: 44366
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: CT
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'04 STi
JBP

Default UOA: '04 STi w/ high copper

[IMG][/IMG]


Just received my first UOA from Blackstone for my '04 Subaru STi. The engine has about 62k miles. Penzoil Platinum 5w30 was run for about 3200 miles with a Mobil 1 filter.

The report came back showing high copper. Any ideas what could be the cause? Some additional background:

1) A couple weeks before taking the oil sample it was discovered that the turbo wastegate housing on the original VF39 was severely cracked (hairline crack is common, this one was much worse than usual. Per Broken Motorsports among the worst they'd seen.).

2) A metal fragment about the size and shape of a gear tooth was discovered in the banjo bolt fitting for the Turbo oil line. Likely would have killed the turbo had it not been for the bus fuse looking screen filter in the banjo bolt. The fragment was about 1/4" square and flat. Very likely this caused some reduced oil flow to the turbo. The Broken Motorsports guys didn't seem particularly concerned about this but it freaked me out.

3) I am getting excessive blow by with oil pooling in the throttle body. PCV valve has never been changed (will be done shortly). Blow by is common in the 2.5l subaru engines but the oil accumulation was excessive.

4) Did a compression test about a week ago. I have good compression, about 155 in each cylinder with almost zero variance. Also no smoking from the oil fill.

New turbo will be ordered shortly. Just wondering if there is any way to isolate the source of the high copper. Thanks for any input you can provide.

Additionally, I have already switched to Rotella Synthetic 5w40 oil and a Purolator oil filter.
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Old 07-24-2009, 06:46 AM   #2
gathermewool
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Location: CT
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14 FXT Touring
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Default

I wouldn't worry about it. UOA are better suited for trending, contamination in the oil such as coolant, and, with a TBN/TAN added in, the life left in the oil.

After establishing that you don't have a coolant leak and no gross and obvious problems, a UOA is really only good for figuring out how long of an OCI you can run before the oil might begin to break down. With out at least a TBN you'll never know
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Old 07-24-2009, 03:40 PM   #3
Avant1
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2008 Sti
Dark Gray

Default Weird....

I had 3 UOAs from the same Blackstone test day 7/23/2009...and all of them came back with high copper. Weird....it looks like your lab number was w/in 5 of mine...hmmm.


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Old 07-24-2009, 04:10 PM   #4
Avant1
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I also posted this on BITOG, to see if there will be some info there. I wonder what the test numbers between ours showed?

Mike

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1542821#Post154 2821see
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Old 07-25-2009, 01:10 PM   #5
gathermewool
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My copper was 272 ppm for the factory fill with 3560 miles.

I did a couple of short OCI and resampled for analysis. Copper dropped to 31 ppm with 3000 miles on Cam2 5W-30 (free oil change from dealer)

I'm running RTS 5W-40 now to 5kmi, and will resample and send it out for analysis.
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Old 07-25-2009, 01:13 PM   #6
BPM02
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2002 WRX
WRB

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Weird how close they are
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