Thread: UOA Worry...
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#2: 09-21-2012, 04:42 PM
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Also, I've been looking around about newer subarus and higher copper levels and came across this info...

"Our cars have a copper lined oil cooler which seems to keep copper readings higher than, say, WRXs. I've gone through 3 OCIs with T6 and just finally got my wear metals in the "normal" range, and that's after 20k miles." -2012 STI

"Here's what Dave at RedLine had to say:

"The copper level is higher than I might expect, though not likely a bearing as lead and tin would also be elevated. The copper is likely from an oxide inside an oil cooler or an over plate on a cam shaft, either way nothing to be concerned about.
I don’t recall seeing oil analysis specifically from this low mileage STi.

More: "In a new cooler the copper would tend to have a fresh non passivated surface, the oil will tend to react with that copper oxide, appearing initially as higher levels in oil analysis tapering off over time."