Considering this oil. http://www.summitracing.com/parts/SUM-MGSAE30/
I have a brand new 350 crate motor that has been on Castrol 10-30 since start up 10,000 miles ago. Is the extra ZDDP necessary for new flat tappet engines or just at break in.
I have a brand new 350 crate motor that has been on Castrol 10-30 since start up 10,000 miles ago. Is the extra ZDDP necessary for new flat tappet engines or just at break in.