I have taken my truck in for oil changes 3 times in the last year. The first two times the invoice stated that the transmission fluid check was "declined" due to a sealed transmission. The last one states that the fluid was checked.
My truck has a 100,000 mile "sealed" transmission, with no dipstick or reservoir for filling. The only way to access it is by the drain plug underneath the vehicle, which looks very similar to the oil drain.
Following my last oil change my transmission started slipping. The dealer checked it and found a "mixture" of the correct transmission fluid and an unidentifiable fluid. The fluid is dark brown, cloudy and smells very burnt.
My transmission is ruined, and WalMart is the only one who has worked on my truck. I am trying to get retribution from them now, as I cannot afford a new $4000transmission on a vehicle on which I still owe $5000.
Review about: Walmart Oil Change.