some stp has the added zddp additives

red or blue bottle,stp has some oil stabilizer with the zddp and is added by the quart bottle

if you can find it..think they stoped,I stocked up on it last yr,got 6 qrts left

I also have gone roller cam for this reason with the oil and have gone to the napa 10/30 with the stp oil stablizer

there is..

GM eso oil additve from the chevy stealer

use some 15/40 deisel oil like the napa fleet grade 15/40 this still has a higher level of the zddp in it also

theres more snake oil out there if ya check around