Not all oils resist shearing and viscosity reduction the same.

Add in fuel dilution potential over time for visc reduction, and your 10w30 ends up pretty thin at 220f.

I would run at least a 10w40 with your oil @ 220f. Whatever you do, get some samples tested after some time in to determine how it's making out.

Thank You Both! The chart was very heplful. I will stick to the 10/40.

That's a solid choice! My personal favorite is 0w40 Mobil 1 because that historically has used Group IV base stock (PAO). It's been harder to find is 5qt jugs lately, however.