i-want-in,

I don't think there is anything wrong with changing oil, filters, plugs or any maintenance items for that matter before BMW's recommended intervals. If that is what you like and if it makes you feel better, then by all means do so. I just think that on the flip side, there is the arguement that doing it significantly before the manufacturers recommendations is somewhat of a waste of money as there is no proof that it actually extends engine life.

How long has BMW had the 15,000 mile oil intervals now, 10 years or so? In that time period there have been many engines run hundreds of thousands of miles following these recommendations and so far there have not been any large scale engine failures from doing so. BMW seems to think that 15,000 max intervals wont harm your engine. I happen to agree with them and I would say my proof would be a decade of success with 15,000 mile changes. The burden of proof would be on you to show us otherwise.

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Profeshenal spellar