MB's that require premium say it on the cluster and by the gas cap.

I bet they like premium better though, I knew someone with a 1985 280te, and she was mean to it (always ran regular, did terrible maintenance) and it ran OK, but the exhaust smelled cruddy and it got terrible mpg's...(12)....she's a car abuser....and it died when an oil line burst on the freeway and she drove it another 4 miles to a rest stop, where it made noises...and seized. The car was real rusty though, dead leveling system, etc...interior bad...178k on it. She paid 5k for it, then spent 2k on all new brake system, and later another 2.5k on a new tranny, then 1-2k on fuel pumps and random fixes. It stranded her 5 times over the two years she had it.

So she spent about $12k on a car that she drove for barely two years, and put less than 15k on. Thats like 83 cents a mile! Not including gas and towing and such. Yikes. She then bought a new mazda.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)