I know it isn't like most people's experience on here, but I replaced mine on the 240D with a turbo model starter from O'reilly's for around 80 bucks. It has a lifetime warranty, so if it ever breaks I take it back and get another. I can't speak for replacement difficulty, on the 240 it's pretty easy though.

I may have just gotten lucky, who knows. Mine seems to work fine.

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'79 240D 4 speed manual 105k miles