I changed our oil the first time at about 100 hrs. At 20 hrs, I don't think I'd worry about it for a while, unless it makes you feel better to change it.
FWIW, I went with 10w-30 Mobil 1 full synthetic. We mostly run the generator for the ac units while traveling..
I now have about 200 hrs on the generator and will probably go at least another 100 hrs before changing. [emoji879]
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