Quote:
Originally Posted by TheRealWorld
Myth: You should break in your engine with conventional oil before you start using synthetic oil. Again, there's no manufacturer we're aware of that makes this recommendation. Mercedes, Porsche, Corvette, some Cadillacs, Volkswagen, Hyundai and many other manufacturers' cars come from the factory with synthetic oil.
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Car engines are now manufactured to such good tollerances, there is no real need to "run in" an engine like you used to have to do a few (many) years ago.
For air-cooled motorbikes, there is a thought that you should "ride it like it is stolen" from day one to quickly get the rough edges off everything. Running it in slowly will "glaze" the barrel and you will never get the rings to bed-in properly - well, it is one opinion and there are many others as well so I am not recommending it over any other choice EXCEPT change the oil regularly.
Jeff