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The thing is, I don't have short trips 100% of the time. I occasionally have to jump on the freeway and drive an hour away. Thinner oil at that point is either going to need to be cooled, or damage will be done (the last paper goes into how thinner gear oils do in fact reduce trans life). So, if I went with thinner trans oil, I'd have to find a way to tap into the trans case, and pump the oil through a cooler or something.
The trans is designed for 75W90. I know that that is safe to run. I could experiment with lowering the viscosity, taking oil analysis to see whats going on. Or I could try this heating mod.
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