I've had my '94 E320 Cabriolet changed at Jiffy Lube twice and been happy both times. In fact, on the most recent change, the mechanics noticed a tiny leak in the fuel line that appeared only when the engine was on and the system was under pressure. They didn't have the time/parts to repair it but I took it to my local MB mechanic who did.

I used to change my own oil but in winter it's no fun ... and I ain't getting any younger. So I've previously had Jiffy Lube do oil changes on an MB 420SEL and a BMW733 and even my 1952 Cadillac convertible, and never had any problems.

Tim