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Upper threshold for copper content in oil?

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YOUR RESEARCHUpper threshold for copper content in oil?

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POST 1Original post

Hi all! Just got my most recent oil analysis ( 987.1 CS) back from the fine folks at Blackstone. While it's generally good news (no signs of bore scoring!!), I did see a minor to moderate rise in copper content. Levels rose from 17ppm in the first report, to 21ppm (roughly a 26% increase) in this report. However, there were an additional 1200-1300 miles on this sample (approximately 36% more than the first report). Is there a threshold at which I should be concerned about potential rod bearing wear? Currently hear no strange noises, and have consumed a single quart of oil over the last 5500 miles. The car is not tracked, and always thoroughly warmed before being driven hard. Thanks in advance!

POST 2Original post

Copper itself is very soft, and is intended to wear in preference of other components. The most common sources of copper are going to be the oil pump, oil cooler, and wrist pins. For a gasoline engine 50ppm is when you should at least take some notice, because wear components shouldn't usually produce that concentration over normal timespans. Several hundred to one thousand ppm is when it is more than likely indication of future component (not necessarily in the engine!) replacement, which is usually a sign of excessive bearing wear or (more likely) a coolant leak and cross-contamination from older radiators. 21ppm for a 12-year or older car is WELL within normal expected ranges.

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