I am having the exact same issues w/ my '81 240d...last night it got down to 20 degrees and the car would barely start. I replaced the glow plugs a few months ago but didn't know you were suppose to ream the holes. I am hoping that if I do this it will take car of my hard cold starts.

Also, my car is not equipped with a block heater. I was wondering how hard the stock ones are to install. I have seen magnetic ones that stick to the block, but I don't think those would do much good.

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1981 240D