I own a 2008 CX-9 with 117K miles which still has original transmission fluid, yup, never replaced. After this realization, I have spoken both with a local mechanic I trust (although admittedly not a Mazda expert), as well as the local Mazda Dealer (who I only partially trust). Although the manual does not specify when the transmission fluid was due to be changed, the Dealer tells me it should have been done (flushed and replaced) at 60K. They serviced the vehicle at 40K and 80K, but since not at ~60K, they did not pick up on the fact the transmisison fluid was never replaced. Ultimatley it's my fault (and my wife, it's her vehicle) for not paying attention to this critical fluid. The fluid is not black, nor burnt, but a little dirty. Dealer says that since over 100K, not to replace it - too risky. That gears might not line up afterwards. Mechanic says if a drain and fill, not a flush, makes sense to replace it now. Asst Service Manager at Dealer says they don't do a drain and fill, only a flush, since it holds 12 quarts, and a drain and fill only replaces ~5 quarts, so 7 quarts would still be original/dirty.
Thoughts on what I should do?
