The P.O. of my '85 300D told me the dealer he always used and even gave me the mechanic's name that always worked on his vehicle. He wanted me to be assured that he was on the up-and-up about how well he maintained his Benz. I went to the dealership and although they wouldn't release the records to me, they allowed me to look them over and take as many notes as I needed.
84 500SEL EURO 87K
85 300D 267K (and still goin' strong)