Their not really Hybrid, just propane. It doesn't really matter if is a suit case generator or huge trailer mount, propane does very little wear to the engine. On mine, I would do the maintenance and the oil and plug were always clean. Even the propane forklifts at work have very little maintenance. Issues wise, I had more issues with my gas generators if they sat for long periods where my propane didn't. My last propane was an Onan. I think i ran that for eight or ten years before I got rid of the camper. It was flawless.