Yea looks like the break in for another 500 miles is crucial. I will look at the Gibbs, Penn and Stp options with the zinc. All you guys have been helpful Thanks
Hello Mopar friends. Just in need of a little advice. I ran my 340 engine on engine stand to break in and all is good. Looking for advice to use conventional oil or synthetic moving forward. Also what weight / viscosity. Thanks in Advance....Bill.