RivRaptor
Full Access Member
I was told by someone in the oil industry that muli-weight oils work on the principle of finely ground rubber based material that flows easily at cool temps but as they heat up they uncoil like little springs. The more heat, the more they uncoil hence they take up more room and here by thickening the oil. Most manufactures will recommend a slightly higher viscosity for hotter climates but not much due to tighter tolerances which is dictated by fiction (gas milage). A car in a cold climate running right off the thermostat @ 185 deg is gonna need a lighter weight oil than a car in a hot climate where the car runs 210 deg regularly. This person was also not crazy about 0w oils... in his opinion 0w oils are great in the lab, but in the real world u need to be careful because if anything goes wrong with your oil....your running metal to metal. So change your oil often if your hard on your truck and dont worry about it.
