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Old 02-25-2013, 12:57 PM   #61
bmwm5lover
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Quote:
Originally Posted by mudmojo View Post
Build dates on or past Mar 2000 had newer piston ring designs.

I think it was at that time BMW suggested to not use 10W60 anymore.
So the story goes...
03/00+ in some cases burn as much and more than early ones. The nature of hand build engines that haul ass in a 4000lb grocery getter.
I miss mine, is it April yet?
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Old 02-25-2013, 05:36 PM   #62
windwagen
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I get it now... the lower viscosity allows the oil to leak back past the rings into the crankcase. The high viscosity stuff is just too thick to allow that to happen and it gets burned away ...... Doesn't work if your car is upside down though....

Maybe the lower viscosity helps BMW meet the CAFE requirement
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