Cooling and lubrication are closely related. The viscosity of oil varies with its temperature. A 30 grade oil has a viscosity of 3 at 302F and thickens to 10 at 212F. It further thickens to a viscosity of 100 at 104?F and is too thick to measure at the freezing point of 32F. The fuel system may like the cooler temps, but the engine oil needs to be near 212 for the least amount of engine ware.
Bull Nose Formula, 461, TH400/ 3.08 8.5 / R44TS.
Edited by - Blued and Painted on 19 Jan 2017 11:42:57 AM
I would prefer to run a lighter oil than run close to 210 all the time. I'd think heat kills more motors (and trans) than slightly too cool oil. But, i can see the worry, and i know modern cars love that 210 sweet spot for efficiency.