Originally Posted By: Silverado12
I just changed the oil in my Generac 20K propane whole-house generator after 2+ years using Mobil 1 10W-30. I think it calls for 100 hour maintenance, and IMO a generator would be the perfect application for Mobil 1 20,000 mile extended oil.
A friend of mine recently retired as a Gernerac tech. Per his instructor at the Generac school, he used M1 5-30 in all of his PMs on Generac gens. He serviced many generators and never had a problem with lubrication. Other problems was a different matter.