I know a lot of people with whole house generators and none of them have it for a shtf scenario. It's for the constant power outages that plague our grid. Some are 30 minutes, some are 6 days. NG always runs.
During the outage after Hurricane Laura NG went down in this area. Propane trucks were running. In the Texas freeze outage NG went down. If you run a Generac on NG most can be also run on propane by the turn of the built in adjustment.
Our Generac 22KW is 5 years old and hasn't given any trouble at all but it will use a pint of oil every 2 or 3 days when running hard. Several people I know ran them low. One neighbor kept restarting his when it apparently shut down for low oil pressure and ended up doing an engine rebuild. After that I started calling folks and warning them to shut down and check oil. If I remember correctly mine holds 2 quarts and a pint puts me down to the add mark. I'm guessing 2 pints will put it below the stick.
