It helps if you have a cast iron block and head, it can take excursions into the upper end of the temperature range better than aluminum head engines. I would be much more careful with an aluminum head, especially during the test phase.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked