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      06-16-2009, 08:22 PM   #11
808MGuy
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Drives: 2009 E90 M3
Join Date: Jun 2008
Location: Oahu, Hawaii

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Quote:
Originally Posted by elp_jc View Post
No current car has any kind of oil 'sensor'; it's just an algorithm; that's why you have to reset them . Each manufacturer uses different criteria: ignition cycles, fuel usage, along with average speed, duration, mileage, etc. But all are just a guesstimation at best.

AFAIK, only some big trucks have oil sensors, but even those can only measure viscosity, not contamination, additives, etc. To me, changing oil every 5 to 7.5K miles on a high-performance engine is cheap insurance. Also worth noting is BMW used to recommend changing oil every 3K miles, but when they started paying for oil changes, that was conveniently raised to 15K miles . Good day.
Just from my visual inspection of the oil that came out, I thought the oil was pretty clean. Definitely not black and dirty but the numbers on this report show that maybe a shorter interval is something to look at. I'll just wait and see what happens with the next oil change which will probably be in 5 months or at 15k miles.
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09 E90 M3 - Interlagos Blue / Black Novillo / Sycamore Anthracite / Eibach / HRE