As fast as you can if the car is in good mechanical shape!

These cars (even the underpowered old Diesels) are built for Autobahn cruising at high speeds and high revs. As long as your mechanicals are in good order, then zoom away

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys