Quote:
Originally Posted by Ram Jet
Then I read an article on the Mobil.com website about a BMW 530i they ran on a test bed for the equivalent of 500,000 miles on Mobil One synthetic. When the engine was torn down 90% of the engine parts could have been put back on the new manufacture assembly line.
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That really gets to my point... I have a Vega engine that had something like 200,000 miles on the crank, running with dino oil, and the journals measured within new tolerance. It doesn't matter much what oil you use, as long as it's there in the right amount and kept clean.
The exceptions are engines like racing 2-stroke snowmobiles that really do tax an oil to its limit by expecting to keep pistons an cylinders happy at very low oil/fuel ratios and very high loads. But they have numbers like 300 hp from 1000cc.