Quote:
Originally Posted by SMOKEY53
I guess that makes sense, if it's a warranty claim - that way BMW isn't copping the cost for replacement fluid on top of the parts required.
But for the same reason that people think the flush causes issues (it dislodges gunk and pushes it into areas that affect the shifting function) I would have thought tipping dirty fluid back into the transmission would do the exact same thing.
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By the time BMW pays a shop to catch the fluid, and refill it, it would likely be cheaper to put new fluid in.
The risk isn't tipping the fluid back in, but rather the higher detergent levels of the new fluid compared to the old fluid. When the amount of detergent changes, the fluid is more likely to scour out deposits that in many cases weren't hurting anything. If they make it to the filter, fine. If they lodge in the valve body in one of the many small orifices, that is when problems occur.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
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