Hope everyone is having a great Labor day week end and hope no one has any issues. I'm looking at the type of oil used in a generator, I have a Cummins Oran RV QG 3600 LP. It's a propane generator and I haven't used it much but I did change the oil a little over a year ago. At that time because I live in Iowa and the temps can get down in the single digits, I put a 10W30 weight oil in it, which is recommended by Cummins. I am wondering now if a synthetic oil could be used? Any thoughts out here about this?