I have a 430 with the same engine as the 855. Got around 4k hours now. Also has a little smoke when cold, I would not worry about it too much. Injectors might be getting a bit lazy. Run it! I've been pushing the 430 hard for the last 1500 hours mowing 8 acres in summer and plowing a 1000ft driveway in the winter and nary a whimper from that little oil burner!
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f350 sitting in shop on blocks
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