2012 Nissan Pathfinder VQ40DE V6 with 8,000 miles new to me I plan on doing a fair amount of towing this summer and I plan to run either M1 or Shell Full synthetic 5w30 on a continuous basis in this truck. I have a full case of Formula Shell conventional 5w30 sitting on the shelf should I use it up doing short OCI in the Pathfinder or just use it in something ells? I guess I am worried about the Shell conventional oil in the VQ40DE V6 under hard towing in summer heat I hear this engine is hard on oil? Is a cheep conventional oil ok for hard use for say 3,500-4,000 miles max?