OK, I know this is an old thread, but I'm hoping to narrow down my smoking '79 240d problem.

It does smoke on cold startup, which is normal and I'm not concerned about, but even at 180C after an hour's drive, it smokes white visibly. I run it on a biodiesel blend, and it does not smell like oil. I have had the valves adjusted, new glow plugs, old leaking injector lines replaced (granted, with some nice used ones), the radiator flushed and pressure tested. Oil changes regularly, and even the gas cap and oil cap replaced. I'm pretty sure at this point it's unburned fuel, but what else can I do to test and/or fix it??

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'79 MB 240D "Eres"