Operating a generator during long idle periods removes moisture, lubricates the engine, and exchanges stale fuel in the lines. Manufacturers recommend a regular monthly exercise schedule.
Oil, like water, seeks the lowest point in any system. The same is true for an RV Generator. Over time, the oil drains to the lowest point in the engine and leave the parts without lubrication. Exercising the generator redistributes oil throughout the engine. Running the generator also creates heat which drives off condensation and moisture. Over time, oxides form on idle electrical parts in the generator’s contacts that regular exercise removes.
Cummins-Onan recommends a two-hour exercise period every month the generator sits idle ro runs infrequently for short periods of time. Start the generator and place a load on it equal to half the maximum continuous load rating. On a 6000-watt RV generator, two 1500-watt space heaters will load the generator with 3000 watts—half the rated load.