Quote:
Originally Posted by dkoldman
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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Not sure on the science but this is what Cummins says:
Can I use synthetic oil in my Onan generator?
Cummins does not recommend the use of Synthetic oil in Onan RV generators as
there are no long-term benefits for the additional cost.
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