I've heard of some who prefer to disconnect the ignition coil on the 116/7 motors so that the chains doesn't slap around as much, the idea being that the engine turns fewer RPM at cranking speed as compared to idle or high idle.

If I had a 420sel, I would probably use this technique.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E