Quote:
Originally Posted by PBB66
Hmm. Yeah I understood it was uneven wear. So you are saying the culprit is the original ATF that Chevy used with the 8L90? And that replacing with the blue Mobil 1 as recommended is the hoped-for solution as, not being hygroscopic, it will potentially allow the clutch plates to start wearing more evenly, reducing deterioration and buildup of shavings in the fluid?
That re-tuning the transmission is not entirely necessary?
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Re-tuning not necessary. The fluid change is intended to remove the accumulated water which has, in a way, become part of the ATF. With lubricants, you always hope for the ole "water and oil don't mix" business to keep you out of trouble. But a hygroscopic lubricant actually attracts water, and even small amounts can drastically degrade the fluid. All the chemical engineering intended to make things slip and slide off the parts and each other goes out the window.