Originally Posted by Redapple
I use the Rotella 15w40 in my Onan 5500 watt gas generator with no issues at all.
Same here. I change it same time as the Cummins. Although, I'm in the middle of 96 hrs straight use, running 3 AC's, in 103 degrees, for the 2nd time this summer. I may need to change it sooner.
Scotty and Kristen, Airedales Dagny and Wyatt
2007 Newmar Mountain Aire 4528, 450 HP ISM, Allison 4000, 8 Trojan T-105's
2014 F150 4x4 Crew Cab Platinum 157" WB
Roadmaster Blackhawk 2, RVI2 Brake System