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MetalGator's avatar
Aug 28, 2017

First Oil Change Onan 5500

We just purchased a new motorhome recently. I noticed in the owners manual for the generator that they suggested the first oil change to be done at 20 hours. I already had about 25 hours on the generator so I decided to change the oil this weekend. I ran the generator for about 45 minutes running both AC units to get the genset up to temperature. I was able to easily drain the oil and change the oil filter. I couldn't believe how easy it was to change the oil! That was before I started filling the generator with 2 quarts of oil.

First quart went in OK and then the first half of the second quart went in OK. It took me about 30 minutes to get that last 1/2 quart in the generator. If I poured too much, oil would come out of the fill port and make a mess running down the side of the generator. My legs are still sore from being crouched down next the the generator trying to slowly add the oil. I guess next time I will fill the oil filter first and maybe that will help. Any suggestions for the next oil change?

It doesn't appear that you can overfill with oil since the oil will just spill out the oil port if you put too much in. I was starting to think I was trying to add to much oil but the label on the generator said 2 quarts.

Burch

11 Replies

  • Label on the Gen reads two qrts.
    What does the manual read ? 2 qrts dry or 2 qrts with oil filter ?

    If the oil filter is mounted vertical then yes fill the filter up as much as possible. If its mounted horizontal you could add some in and spin it on fast ...

    On our onan gen there is no filter... Thought that was odd !

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