which oil would you use in your flat tappet motor:Brad Penn 10-30 semi or 10-30 VR1{VV205} or valvoline conventional,not for street use,{VV850} 10-30 and why?I've noticed the ZDDP is Lower on the BP then the Valvoline
I have used the brad penn 20/50 in my alky engines and also vr1 20/50. Seems to me that the b/p oil does not break down as fast as vr1. bearing life has been extended since using b/p oil. I am running the same r/m bearing 3 seasons drag racing on 1/8 mile.