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 ...
Forum Discussion
MEXICOWANDERER wrote:I've run several pickups and a drill rig on propane and used whatever oil was the cheapest. Last PU had well over 300k mi. before I sold it with 2 valve jobs only. Rest of the engine was still like new, and the yearly oil change yielded oil that still looked like new. I have no knowledge if cheap oil is low ash on not, but it sure wasn't aircraft grade.
A note: LPG engines -demand- low-ash oil. Aircraft engine oil is low-ash. When Shell Oil Co introduced it's Fire & Ice 20W-50 oil in 1971 I walked up to the quart-canner and I could smell the zinc dithiophosphate additive that made the oil able to sustain high temperatures. Rotella oil is huge tank blended oil. Rotella T is batch oil formulated in 3,000 gallon kettles. The specs standards for T were much stricter.
