"I'm running about 60% duty cycle at the moment in closed-loop, but I have to wonder; Is there something wrong here??"

Do the numbers oscillate around 60%, as they should, or does it stay fixed on one number?

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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