Sooner or later, most folks that have both Diesel and gasoline fueled cars will add the wrong fuel to the tank. There are A LOT of online forum posts on this issue, and I just had to face this with our 2008 R320 CDI. Fortunately, the car was not started with the 18.95 gallons of gasoline in the tank. We had it towed home then I went to work. The R320 is not a particularly easy car to work on...