I have just purhased a 98 auto e200 with 147,000 miles lpg converted. It drives great. I got the equivilant of 50 mpg on my 220 mile drive back after collecting it. The auto box is smooth but when warm it clunks quite bad when I select drive or reverse. The brakes also tend to come on with a clunk although they do stop the car effectively with no pull to the side etc. I don't know if the problems are linked. Any suggestions would be appreciated.