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Thanks for pointing this out. 15k on non synthetic? Or does BMW spec synthetic oil? What weight? ( sorry I really don't know) Only real way is to have it analyzed. Anyways to approach 15k oil changes it better be some good stuff! Or have 20 quarts in the system.
asphaltgambler;9227544]^^^ actually that is not true per BMW^^^
The previous generations of E39, E38, etc - were programed to go as long as 15K between oil services depending upon how hard it was ran. This was measured essentially through injector pulse width / time / RPM's and ambient temperature.
The current generations utilizes similar, but more comprehensive measurements called CSB - or (Condition Based Service), but the mileage target of 15K remains believe it or not.
I personally service mine @5K - It gives me piece of mind...........[/QUOTE]
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Dave K
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