I thought it was a 4 cylinder. It morphed into the 240 a few years later. You are right about the glow plugs. Poor injector spray pattern will burn the older glow plugs up in a heartbeat. They were a wire loop and the fuel spray would work like a blowtorch on that wire loop sometimes only taking a couple of days to wipe a brand new glow plug out.
I would not turbo that engine. The turbo versions had considerable modifications to hold up under the added strian, including nozzles that sprayed oil on the bottom of the pistons to keep the pistons from melting, not something you could easily upgrade. Been a long time since I looked t a 190D or a 64 MB car with those fins.
regards
Mech
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