Basically, I am tired of going to China Mart and would like to do buisness somewhere else. Between the both it will cost about the same for each OCI. Everyone agrees that NAPA is made by Ashland w/ possibly a diffrent add pack. My Supertech here is made by Warren. Will the NAPA work good for 4k OCIs on my 02 5.3 GM, Which has had valvoline products most its life?