I need to find answers for my problem, my transmission shift and runs fine in city traffic but once on the highway I smell a burning odor from the car. Oh yeah one thing I forgot to tell you. This only happens when I'm at 60mph then I step on the gas hard, I feel the tranmission down shift to 4 or 3 gear and at this piont the car is at 100mph. I always smell an odor when the car travels past 100mph. I know I should not be driving at this speed but on the S500 it is very easy to do when you are not looking at the speedometer. 100 in a Tercel is dangerous but in a Mercedes it feel normal. OK, so when I gas the car hard (more like flooring the car) past 100mph I smell the burning clutch smell.

Is there anyway to repair without replacing a trancsmission? Is it just my tranmission fluid needs changing. I have only driven the car like this a few time just to see how fast It would go. The minute I smell the burning I stop. I do not have this problem in my E420 which has 10K less than my S500. Other then high speed driving, I do not smell anything from the car. What should I do to take good care of my car.