Since the starter is on the bottom of the engine, it is unlikely to get heat soaked, especially not from a high speed drive where there's lot's of air movement.

I'd suggest the simple things first:

1. disconnect the battery then clean , tighten the starter terminals

2. clean and tighten the ground strap

3. clean and tighten the battery terminals

4. Get the battery load tested and the alternator tested for proper charging at Autozone.

See if this fixes your problem before doing anything else.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked