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Brand Of Engine Oil For Onan 7500 Watt Generator

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This is an "after the fact" question for the forum.  In the rush the Saturday afternoon before Hurricane Harvey hit Houston, I changed the oil, oil filter and air filter on my Onan 7500 watt generator (the motorhome was to become the respite/power provider in case my home lost power which by the grace of God did not happen!).  The generator was within 12 hours of needing a 150 hour service (the generator has 438 hours of total use).   I purchased Cummins brand filters for the generator at PPL Motorhomes in Houston.  PPL did not have Cummins-Onan brand 15w-40 oil so I purchased Shell Rotella 15w-40 at Walmart.   Is it safe to presume that the Shell Rotella will perform OK when I use the generator continuously for 48 hours next weekend (September 22-24, 2017) for my LSU football tailgating outing?

Thanks for your thoughts!

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Nothing wrong with the Shell Rotella 15w-40. I think it is better than some of the other 15-40 oils out there. I have been using Shell Rotella T6 5w-40 in both the coach and generator.

Bill

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Save your self some money.  In the future use the Rotella in both the eng and gen....and avoid Onan brand oil.  I don't mean to infer Onan makes bad oil, but $11 quart plus shipping is pretty steep.

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