Quote:
Originally Posted by Tannaton
This can be mitigated by doing it in 3 or 4 partial changes (aka sump dumping) with a few hundred miles between them.
2 - The difference in viscosity between the oil and new fluid is so great, the gearbox electronics do not adapt quickly enough and an old fragile box is further damaged by shift shock etc. as it re-adapts. This can be mostly mitigated by clearing the adaptation memory or (even better) re-adapting the gearbox after changing the fluid.
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I always do both of these when changing fluid.
So far on both the 5 and 6 speed boxes, I've had no issues but always a definite improvement.