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Old 01-22-2001, 12:09 PM
420SEL 420SEL is offline
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Join Date: Jul 2000
Location: Toronto, CANADA
Posts: 1,193
I don't think it will affect your engine longevity. As long as you are nowhere close to the redline, most engines actually run better at higher RPMS. I don't know how high your engine should rev. My 1986 420SEL revs around 3500 at 75mph in third gear, a little under 2500 in fourth. I wouldn't be surprised if this is normal given your engine size. I am assuming yours is a european model. Unless any one can tell you differently I wouldn't worry. One thing to consider is that a high reving, hard working engine like your will benefit from frequent oil changes, even more than a lazy engine, like my V8 or your C230. I would just change the oil more frequently and not worry about longevity.
Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired
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