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 was severely cracked (hairline crack is common, this one was much worse than usual).
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. The fragment was about 1/4" square and flat. Very likely this caused some reduced oil flow to the turbo.
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.
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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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 was severely cracked (hairline crack is common, this one was much worse than usual).
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. The fragment was about 1/4" square and flat. Very likely this caused some reduced oil flow to the turbo.
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.
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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