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Originally Posted by Bimmer360
Tomaz,
I have 100K in the clock and about to have my step 4.4i transmission oil and filter changed, but one guy said in a different thread, and i quote: "You need to be careful with changing the fluid on Automatics with 100,000 miles though. Sometimes changing the fluid on high mileage automatics makes for problems that were not there to begin with." Do you know if this is true?
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Many transmission failures are related to contaminates in the fluid. Merely changing the fluid without changing the filter and cleaning the pan and magnets can cause the sediment to become dislodged and hasten failure. If your going to change the fluid I would highly reccommend changing the filter and cleaning the sediment. I mentioned to check threads for before and after photos to see the astonishing amount of sediment. Further, newly clean fluid may also cause the transmission to shift more crisply and if the transmission was already going to fail mechanically, it would accelerate this cause. Finally, no one would argue that clean fluid in a transmission is better for the life and performance of the transmission. Good luck