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Re: Post 3/2000 Builds Switching to 10w 60? (archive)
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Posted by M5_ZZT on August 09, 2001 at 14:49:37:

In Reply to: Re: Post 3/2000 Builds Switching to 10w 60? posted by 330xi on August 09, 2001 at 13:21:45:

Early M5s have a racing style elliptical piston ring which takes time to "seat" and tightens around the piston as it moves. Post 3/2000 M5s moved to a more conventional, non-racing style piston ring which "seats" quicker and doesn't allow as much oil to pass into the combustion chamber.


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