Ive actually gone a couple years on my genset without changing the oil...and this year changed it and the oil appeared good. As long as its run monthly and to temp there should be no problem changing it now. I think the biggest issue would be fuel. I had some problems last year with genset and part of it was because I didnt run it religiously. So this year, some fresh premium fuel and a dose of STABIL..and a reminder set on my phone to run the genset. Also a friend told me and have been doing it...run the fuel station pump to keep it lubricated and healthy. Just pump it back into the tank.