I am driving from west Tn. to SW Colorado in late July in my '85 4X4 Toy. pickup. I40 90% of the way and it will be hot, 12 hour days on the road. I will be trail riding in Telluride/Silverton area. My truck has been extremely well maintained by the original owner and myself. Always had conventional oil. Engine was rebuilt 25000 miles ago and also had only conventional. I was thinking of going to Mobil 1 for this trip because of the heat and duration of the interstate drive and also because of the slow trail riding. Do you guys think the Mobil 1 will give good benefits in this situation? Any down side? It is a father son bucket list sort of trip, he will be in his '87 Toyota 4X4. Also, what weight would you use? Thank you, Travis.