| I'll do the manual shift-down when really necessary - like passing on a two-lane road. Otherwise, I just leave it in D. I don't think you're doing too much harm unless you downshift a lot at 70+mph.
__________________  1983 Black 500SL AMG with 5-spd manual - 44,000 miles
1982 Blue-grey 300D - 64,000 miles
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