Onan 5.5 oil

Those are what comes from the dealer if you buy the oil change kit too. Kind of pricy. For less money you can get full syn and a wix filter on Amazon.

when I bought my used trailer there were 2 qts of Onan oil in the box. 15-40 syn blend is whats on the label.

Thx, everybody!!. Only have 25 hours on this new unit, but want new oil in it for storage..so out to shop and use my 15W40 Rotella..same as my PowerJoke:)))

Trackrig wrote:
I would run the same oil you're running in the MH engine - assuming both engines are either gas or diesel. It makes life simple and you wont' put the wrong oil in by mistake.

Bill

I guess if running a diesel that would work. Certainly not in a V10. My V10 uses 5w-20. My Onan calls for 30w or 15w-40. I use 15w-40 for wider range of temperature.

I use the Amsoil 10W-40 we use in our quads. That too makes it easy for me. It gets changed about twice per year and we work it hard. Its not unusual to turn it on on Saturday afternoon and not shut it down until Sunday evening. That's running both ACs quite often in a hot dusty field somewhere.

Around 600 hours right now. It still runs like new.

I use 15w40 once a year and I've switched mine to synthetic. Most of the 15w40 I've seen local has been dino so I just order Royal Purple on Amazon...

I use Rotella in mine. The same as my truck so it is easy. Once a year works for me. I fun my Onan for at least 1 hour under load every month during the times I'm not really using it. It has never failed me.

Lincster, mine calls for 15-40 which makes it easy.. Truck oil..:)

150 hours or once per year.
I go by what is on the air cleaner cover. I think 10W30?

I would run the same oil you're running in the MH engine - assuming both engines are either gas or diesel. It makes life simple and you wont' put the wrong oil in by mistake.

Bill