Originally Posted by Hemi ragtop
Mabie I didn’t pose the question properly. I wondered how many miles I needed to put on the engine before I switched it over to full synthetic oil?
Again, it has been Brocken in on dyno and three power pulls.


The Joe Gibbs break in oil is supposed to be run after the dyno for I believe another 500 miles. Re-read their product spec sheet. Then I believe you can switch to what you want.