I have around 35k miles on the Mercon III that's in my 91 5-speed festiva. Since it's got cold you can hear a whine till it warms up. Didn't do this last year, and my aspire doesn't do it. I thought it would last longer than 35k since the factory fluid still looked good at 87k. The manual states 60k is the recommended life span. The clutch might be shot but doesn't slip so i'm not planning on changing it. Thoughts anyone?