Quote:
Originally Posted by RedlinePSI
I tend to trust what I've experienced before some paper science.
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What you've experienced is a self-fulfilling prophecy. I would hope to shout that if you change the oil at 3k or 5k that your car engine will run like a gem. But it doesn't necessarily mean that changing the oil at mfr specified intervals is going to reduce the service life of the engine, or make it run less gem-like (whatever that means). If you have credible evidence that the latter is so, you'd be doing us all a great service by posting a link. Maybe send it to BMW AG as well. Their maintenance schedules are not prescribed by bean counters (a link for that?). They spend a pretty penny at several independent testing labs like this one developing their maintenance routines - -
http://www.isp-testing.com/en/. And in the case of lube maintenance, it begins with BMW engine development engineers working as a team with their lubricant partner (Castrol in our case) and their tribologists and lube formulators.
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'14 328d, '13 M3 ZCP, '12 535i, '11 335d, '09 Z4 DINAN Stage II, '05 330i ZHP, '05 M3 ZCP, '02 M3, '91 328i, '90 535i, '88 528e, '88 M5, '87 M6, '95 Z3, 95 M3, '93 M5, '87 325e, '89 535i, '86 635i, '73 Bavaria.