I am not familiar with the diesels.. you may try posting this in the Diesel discussion as you have plenty of diesel benz fans there that are knowledgable and will help you answer any questions about a diesel benz. The most important info you need about the car is its maintenance history. That way you will know what things were replaced or fixed. You don't want to end up with a car that will have a high priced part go out on you as soon as you buy it. I hope others here on the board can help since many of the people here have owned a Mercedes far longer than I have.