Someone ran a red light and totaled my 1982 300cd..i ran accross a 1 owner 1985 300sd..with all service records from day one..garage kept car in prestine condition..for some reason when i let the car coast to stop or red light it shuts off...it always starts right back up..i changed all filters and also changed the screen in the tank..i have owned 4 of these now and have never had this problem nor can my mechanic figure it out anyone have any ideas