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      10-10-2009, 03:22 PM   #3
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Drives: Lemans Blue M3
Join Date: Aug 2007
Location: Texas

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A few thoughts on your oil sample results:

First off, if you did indeed use 112 octane race was definitely LEADED.

Better cross your fingers that it was the leaded fuel that caused the spike in your LEAD levels. Otherwise, you may have a bearing problem. It's too early to tell, but I'd get another oil sample out to Blackstone after 3,000 miles just to be safe.

If it does turn out to be an internal bearing issue, these oil analysis reports can be very helpful. This independent third-party oil report can be used to help convince BMW NA, in case any engine repairs or replacement is necessary in the future.

By the way, the other trace metal levels look good, and the total base number of 3.4 is still pretty good. (fresh 10w-60 TWS has a TBN of 8.1)


How much time lapsed between using the leaded fuel, and taking a sample of the oil for analysis?
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