In Reply to: synthetics during engine breakin posted by dave on 08/13/01 at 12:58 AM:
It was wise years ago, to avoid synthetics during a break in. In the seventies, the manufacturing process was not as exact as today. The engine needed to wear in. The low friction properties of synthetics interefered with this.
Now many cars like Porsche come with synthetic in the engine from day one. On every new car I have had, I went to synthetics immediately. Synthetics are fine from day one.
The only exception to to this fact, could be on a rebuilt engine. In this case, follow the rebuilders instructions.