I have a 5000 watt Honda Generator.
The manual says to change the oil every 40 hours.
The problem is - most years, it does not run 40 hours.
Being outside 100% of the time, I feel that with time, moisture builds up inside of the crankcase.
In 10 years of ownership - it only has about 65 hours on the clock.
Yesterday - after we had a near miss tornado, I changed the oil, almost one quart came out and I used it one hour - to let the refrigerator and deep freeze catch up after being without electric for 6 hours.
Being both a small engine mechanic and an automotive mechanic, I wish that it had a spin on oil filter, but other then that, I feel that it is a quality piece of machinery. The low oil shutoff is a good idea, but not enough.
I shut off the fuel and let it run until it ran out of fuel in the line and carb.
How many others - maintains their generator on a regular schedule and not just when the manual calls for maintenance?