WHY: Cummins Onan does NOT recommend Synthetic Oil
I have new 5500 Onan generator and I recently changed the oil. The Cummins Onan manual specifically states that Synthetic Oil is NOT recommended.
Does anyone know why Cummins Onan does NOT Recommend?
Note: They did not say you could NOT use Synthetic, only that it was NOT recommended.
I changed with a non synthetic 15w -40 oil that is rated for diesel & gasoline engines. I had a Onan Rep confirm the oil I chose. When I asked him why Synthetic was not recommended; he cited concerns with deposits on the cylinder walls, cylinder blocks, and emissions damage?
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2019 Sunstar 29ve; Toad Lincoln Navigator; RVi Brake 3 & Command Center; Roadmaster Nighthawk Tow bar & Baseplate; Sumo Springs; Safe T Plus; Onan EC-30 AGS; Vmax 250ah AGM; T-Mobile Internet; H/W Heater / Chassis Disconnect Switches; Southwire Surge Guard 44270 & 34951 w/Monitor 40301; Jet Flo Macerator; Alpine SPE500 Speakers; Visio M21D-H8R
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