I have an '83 240 auto and can relate to your situation. My view, when in this type of situation, is that the life of my engine is not the priority. My safety and the safety of other drivers far outweighs the potential for shortened engine life. "Do unto others" type of thing. Just my .02.

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-RK
'83 240D, auto, 170,000 miles "Old Blue"
'87 300TD, 140,000 miles