Onan Gen Mobil 1 0W-40 vs 10W-40 HM Oil Analysis

I plan to stick with the 0W-40 and am showing great results. 3ppm increase in iron is really not significant.

Looks like great results to me too. There is not one thing here to point to and say this oil is not working here. The iron is low, and the difference is probably below the noise level. On a splash lubed engine with no oil filter. I have this oil around the house anyway and it is an excellent choice for the Onan.