I took our generac out of our old gulf stream a few times. Ours also had an oil leak but I could never pin point it. I would just add more or change it. Although it leaked and I went through two starter motors, the thing ran to right around 8000 hours. To tell you the truth, I plain old abused the thing and it just kept going! If it wasnt for the oil leak, it was a great gen. four bolts, a fuel line and a couple electrical connections and its out. The hardest part if lifting it or dropping it out. Ours lifted out and I simply used some wood blocks, a floor jack and believe it or not, my kids little red wagon was the perfect height to slide it out on to and then I could roll it around and service it right on the wagon.
2014 Fleetwood Bounder 35k