DangerMouse, there is nothing wrong with breaking a motor in with a petrolium base oil,people have been doing that a lot longer than using synthetics. Corvette,Porsche and Viper motors are not built to be "cheap". The new LS6 corvette motor has a 10.5 to 1compression ratio,only a half point lower then the busa's. It is also built to very tight tolerances as is the viper motor, the latter being hand assembled and blueprinted. Both use aluminium blocks and heads and are bored and honed with equipment that is easily a match for Suzuki's boring and honing equipment. Now not to long ago I would have agreed on the ring to cylinder interface statement. But with modern machining equipment and tecniques there are virtually no "high spots" to be smoothed out in the cylinder. Therefore rings can be made to seat at a much faster rate than they used to. Im sure the rings on a new Corvette are putting as much pressure on the cylinder wall as the rings on the busa are. Especially with 10.5 to 1 compresion. The Corvette is Chevrolet's flagship sports car and if synthetic oil was going to keep the rings from seating they would'nt put it in from the factory. Besides,how much oil do you think is left on the cylinder wall by the time the compression rings get to where the oil control rings just wiped the oil off? If there was any at all you would see smoking out of the pipes and oil deposits on the plugs. Anyway, breaking in with regular oil is a time honored tradition and there is nothing wrong with that. But breaking in modern engines with superior synthetics is ok too. The important thing is to use it sooner or later so you can start getting the benefits synthetics have to offer.
[This message has been edited by WARBIRD (edited 05 July 2000).]
