
Originally Posted by
Oscar
I agree.
Running a newish engine on synth or semi-synth is not going to help the rings bed in. You'll get a glaze rather than a seal.
Hear hear!
The problem is that the fully synthetic IS a better oil than the mineral base to the extent that it can threaten the clutch operation on some designs.
The bedding-in process is actually a mild honing where the rings and the bore abrade each other to achieve a sealing fit.
Top quality synthetics can lower the coefficient of friction to the point where this doesn't happen and so the rings never seal properly.
Run in on a mineral oil and then change to synthetic (if the clutch will cope) is the way to go.
I may not be as good as I once was, but I'm as good once as I always was.
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