Our Gulfstream Conquest has a built in generator. I fire it up monthly, let it run for a few minutes and then shut it off but this weekend was the first time I actually wanted to use it and it shut down in about 10 minutes but did provide power until it shut down. There's lots of oil, the gas tank was almost full. It was hot but no hotter than any other generator that I've used that's been running. When tried restarting it, it would turn over but not catch.