This Cummins Onan Commercial QD 12HDKCD is about as clean as a used generator gets. The enclosure panels are sharp and tight, the paint is in excellent shape across all four sides, and there's no signs of corrosion, abuse, or sloppy past installations. It's the kind of unit that makes you think it spent most of its life sitting in a climate-controlled bay rather than grinding away in the field.

It passed a full mechanical inspection across the board — starts clean, runs smooth with no misfires, no oil leaks, no coolant leaks, no fuel leaks. Oil and coolant are both in good condition. The fuel supply and return fittings, ground lug, and 50-amp 2-pole breaker on the control panel all look clean and undamaged. The service tag on the unit even notes the oil type and coolant quantity, which tells you someone took care of this machine properly.

No service records or operator manuals are included with the sale, so you'll want to pull the documentation through Cummins using the serial number if that matters to you — but nothing about this unit suggests it's hiding any history. It's condition-rated new, and honestly, looking at it, that's hard to argue with.