I agree with MB DOC on this matter. Gasoline engines don't need to be run hard like that to keep them cleaned out. Diesels on the other hand, always benefit from a little Autobahn driving. I usually drive any of the cars around 80mph on an extended freeway run, and of course, the gasoline engined ones are cetainly more lazy then the diesel. However, driving the 6.9 well into the triple digit zone is quite fun (traffic permitting--meaning NO traffic).

------------------
Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'79 6.9
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8