Ditto everything that was said earlier; it's a beautiful job!
There has to be a certain temptation to take it in to a Benz dealer and drop it off hurriedly for an oil change--just to wait for the puzzled call once they get under the hood. Alternatively, to a GM dealer, rushing the writeup guy through the routine, with something like "I know it's a Mercedes, but all I need is an oil change--surely you guys can do that!"
'97 SL500, 40th anniversary edition
'04 Olds Bravada (SWMBO's)
'06 Lexus ES330
'89 560SL (sold)
SL--Anything else is just a Mercedes.
(Kudos to whoever said it first)