[Bird]

BTW, exercising your genset UNDERLOAD periodically for an hour or two is recommended, but NOT good for your motorhome's engine, as the engine or exhaust will not reach operating temperature . Thus fuel will pass by the rings , down the cylinder walls and into the crankcase, diluting and contaminating the oil. Unless you take the coach out on the road and bring the engine and running gear up to operating temps you are doing more harm than good.

Very good information.