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      06-16-2009, 05:49 PM   #9
JonM
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Drives: E90 M3 Sedan
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Quote:
Originally Posted by 808MGuy View Post
I'm starting to wonder what the oil sensors are looking for when it gives a recommended change interval. Is it testing for some kind of foriegn content or just viscosity?
I don't think it is actively sampling the oil at all to suggest the change interval.

I think the interval it suggests is based on fuel burn. That is the parameter that the pre-E9X cars used. Burn a lot of gas or do a lot of city driving, and you get shorter intervals.

The GM way had something to do with measuring the capacitance of the oil, but I don't think the BMW system works like that.
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