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I think that if you're idling for a few minutes (<15 at a time), you probably won't have any issues whatsoever.
Idling for hours on end, constantly... I hear that it can be a problem. If you do need to do that, you basically just set the idle up to about 1K RPM so it's not too low.
These engines are going to be a lot more robust than other engines -- the tolerances on stuff is quite wide(including on the ring gaps, which means more blowby), and they'll take quite a bit of abuse.
They have no emissions crap to make life harder on the engine, it's just plain oldschool mechanical diesel.
edit: Also, being indirect injection, I suspect that any extra fuel at idle would be burned more cleanly because it's ignited in the much smaller pre-chamber and swirled into the rest of the cyl. Versus a direct-injection engine where you could have droplets hitting the cyl wall and sliding down?
Yeah, much less chance of washing the cylinders with an IDI. As long as it's tuned halfway decent you shouldn't have too much trouble. You will still get actual water out of the exhaust, though, since there is a lot in the atmosphere this time of year. This is just condensation and nothing to worry about at all.