Whats so special about Onan generator oil
Just doing a service on my generator (5500 Marquis model 5.5HGJAB-1038D). Bought plugs and filter, but they wanted $15 a quart for the Onan SAE 15W-40. Thought maybe I could just get it cheaper at an ...
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I have been using a good quality oil for years, with no trouble. I think changing it at least once per year with the filter, and run it loaded once a month, will give you the best service.
