T tallyo New Member Jan 29, 2008 #1 Does anyone recommend anything other than 5W-30 oil for an Onan 5500 gas generator?
DL Rupper Senior Member Jan 29, 2008 #2 Re: Grade of Oil Onon calls for 15W-45 oil on my Propane Onon Emerald 4000.
R rjann New Member Jan 29, 2008 #3 RE: Grade of Oil My 2002 Onan calls for 15-30. Interesting how different they are.
DL Rupper Senior Member Jan 30, 2008 #4 Re: Grade of Oil I mis-posted. My propane fueled Onon calls for 15W-40. :bleh:
