My friend has a 96 BMW. I was helping him replace the spark plugs the other day, and he tells me that the transmission fluid is good for the "lifetime" of the car. How on earth is that possible? Isn't that a bit like having a lifetime diaper?
Granted, the car has gone 170,000 miles with no flush and filter change. But still, shouldn't it be flushed from time to time? My suspicion is that if it'll go 250,000 miles on the same worn out and dirty transmission fluid, it could probably go a million with regular fluid changes. I mean, it couldn't possibly hurt anything to put clean fluid in, nor with the laws of physics could it be good for it to have dirty fluid.
Am I missing something here? Does BMW do something extra special with their transmissions?