update: the old OVP caused the tranmission shifting issue, and that has gone away.
Still need to replace or clean the O2 sensor, but no real urgent need to do that right away.

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K