Cummins does not recommend the use of Synthetic oil in Onan RV generators as there are no long-term benefits for the additional cost. The best oil you can use for your Onan 4000 generator would be a SAE 30W viscosity oil. Use a 10W40 oil viscosity when changing the oil in your 5500 generator.
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Ed
Some Other Brand w/2020 Jeep Gladiator Toad
Living The Dream in "God's Waiting Room"
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