This is the oil weights Champion recommends. Buried in the OM it states synthetic can be used after break in, but didn't mention it can be used during break in, what's up with that?. The new generator is their tri fuel unit with a 459cc engine. I only had time to unbox it and run it a minute or two with the Champion supplied oil. I've had other small generators, but nothing this big. The only time it will be used for hurricane outages every few years. Last year the outage was 9 days and ran that generator only stopping for fuel and oil changes.
I already have Mobil 1 15w40 Extreme, or would a PCMO be better?