Having started and driven OM617s down to -32 F, I can pretty much assure you that cold weather doesn't have any aftereffects on these motors. In fact, the colder it is, the better mine have run.
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Yes, I run on veg. I'd done around 15k on veg before this trip, with none of the symptoms I described. I purged carefully on the trip, and never ran veg below 80C. (Maybe even 90C.)
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The point isn't only how hot the motor temperature gauge indicates, that is half the equation with VO. What are you doing to preheat the VO prior to injection, and what injection temp are you achieving?