So I've read that I should use a zddp additive or oil such as Brad-Penn from Napa. I just left Napa with some VR-1 10W30 as the guy said he's never heard of Brad-Penn. Is this the best oil for our trucks or should I find some ZDDP additive to add to this oil? Also picked up some seafoam to help clean everything. Oh and my local Napa had the VR-1 $6.19/quart on sale for $4.49 so I stocked up on 10quarts because that seems like a steal of a deal.