New Onan 5500 gen - oil change and air filter questions

I went to the storage facility on Saturday to get the exact model and S/N from the generator, and voila, the oil filter and air filter part numbers were listed on the front of the generator.

I'm planning on using 15W40 oil for now. The manual shows a temp range of 10 to 100 deg F for 15W40, and I don't see us using the generator outside of that temp range. I guess there's a chance we might need it when the temperature is a little over 100, but I think we'll be good.