Red line for a 617 is 4,750rpm. I have run mine there before plenty of times for extended periods on the open interstate. Seems to keep everything in order! I tell you one thing, there's NO carbon on the inside of my engine! This is in a 1980 300SD Turbo. Mileage is 181,000 and still going strong!


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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'86 420SEL
'89 420SEL
'93 300E 2.8
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12
'84 BMW 745i Turbo