Maintenance Free Transmissions

[mdmellott]

In the last week I have responded to two posts on the Infinity QX56 forum, relaying a message regarding "maintenance free" automatic transmissions. My responses were applicable to Pathfinder, QX4, and other models as well. Like so many different makes and models produced over the last fifteen years or so, "maintenance free" automatic transmissions have become the norm. Although they have been designed with higher reliability, to last longer without ever having to change the ATF within the warranty period, these sealed system transmissions will self destruct not long after the powertrain warranty has expired. The ATF used in these transmissions is not all that special. Although there will be a specific fluid grade to use, there is nothing but degradation that happens to the ATF from the day the vehicle is first driven. After 50K miles, the original ATF is unrecognizable as an adequate lubricant and hydraulic fluid. After 100K miles, the ATF is almost worthless for its intended purpose and the transmission it's used in has begun to experience premature wear. If it makes it to 150K miles without catastrophic failure, some irreparable damage and noticeable slippage will be evident. There is no expectation the transmission will last 200K miles unless you ignore the absurdity of the manufacturer's claim that the transmission is supposedly "maintenance free" and change the ATF at least every 50K miles from the beginning. There is no real benefit of being "maintenance free" except to dealerships' new car sales and automotive repair shop's services. Nothing's free. If you have a Pathfinder, QX4, or any other make and model vehicle with a "maintenance free" transmission and have never had the ATF changed because you thought it was not necessary, ever, think again.

[Buzzman]

Thanks for the lecture.

[Mike W.]

Is it everyone now? I know my favored BMWs kind of pioneered that lifetime fill philosophy. The joke in the BMW world is they're right, it is lifetime fill. It's just a short lifetime. They make it especially difficult by not even providing a dipstick, just a hole in the side of the case and you have to check it while running and hot. A delightful chore I've had to do more than once.