Sensei
Well-known member
I'm sure alot of you may already be aware of this, but I am surprised by how many people, even full time mechanics that pride themselves on keeping up to date that have not heard yet. The EPA recently required oil companies to remove the zinc from motor oils as it damages catalytic converters. Zinc is a lubricant that roller tappet engines can do without, but flat tappet camshafts are getting wiped left and right. Shell Rotella T oil (made for deisel trucks) and Valvoline racing oil still have zinc. Other than that, you need an additive. God bless, Sensei