I got my '85 for a song because it had 'no power on takeoff'.

The boost line going from the overboost valve to the back of the turbo was broken at the banjo bolt. A quick cleaning and reconnection restored all power.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car