Therefore, we need to consider some other alternatives to your standard tank full of gasoline. Propane, methane, or bio-gas are some of these options.

The problem with using any of these alternative methods of fuel is that their chemistry is wildly different from gasoline. Propane, methane, and other gas fuels come from the bottling facility with odorant products added such as ethyl mercaptan, a product not intended for engine use. (Ethyl mercaptan is added to assist people to find leaks. It has a very characteristic odor.)

And what if you have a dual-fuel generator? If your generator can take both gasoline and propane, you need to know the intricacies of what makes it work (and what's keeping it from working).

What's hurting your engine?
To understand how we can prevent damage to our engines, we first need to know what are some of the prime reasons damage takes place. Inside an internal combustion engine, we find these as the main ones:

Abrasion
This is caused mostly by dust particles that make their way into the engine. The oil and air filters catch them, but particles smaller than a defined size (your filter indicates this size in microns) will always be there. The carbon deposits produce an abrasive effect too, which naturally break down and get into the oil flow.