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drain 4 me 900

Norm, the usual failure mode for tranny fluid is two-fold: overload with clutch facing and wear particles, and oxidation and viscosity breakdown from high temperatures. Over time, both will contaminate the fluid and it begins to appear both brownish in color and with darker wear particles in suspension. A simple pan drain ensures that about 1/4 of the system fluid is replaced at a time. A flush, on the other hand, replaces all fluid and removes most contaminants. I used to agree with you, but my experience on eight cars (both GM and Volvo) is that the flush is a good idea, especially if followed by synthetic ATF which is not subject to oxidation and viscosity breakdown. It has demonstrable effects on shift quality, tranny lifetime, and fluid appearance.






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