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Given: Engine oils wax and thicken over time. What happens to gear oil over time? In my motorhome with a Dana S110, I will never hit the recommended 100k service interval. Jeep also states the gear oil in their manual transmission is good for the life of the vehicle. (seriously) I have two...

If the problem is thickening oil at startup, not thinning oil. Why do manufacturers recommend oils with a flow rate at that could be better for startup? If the target is 10 at 212, and they all get there 0w30, 5w230, 10w30, 30; with the only different being flow when the engine is cold, then it...