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I don't have any definitive proof, but I highly doubt the transmission oil is overheating to the point of failure leading to transmission failure - in our specific situation.
the AZ6 unit is exposed to significantly less thermal stress (relative to the oil's limits) compared to the mechanical stress limits.
Our unit uses a 75w-90 gear lube - were talking capacities of above 300°F. And if you're using higher quality oils, we're talking around 400°F or more.
And as CSG Mike explained - normal oil analyses - and he tracks regularly (I need to learn from this man (or women, who knows) one day).
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