Just to clarify, I'm in South Florida, where it's hot n humid much of the year. I use the following oils:
2009 F150 5.4V8 3valve M1 10W-40 High Mileage (this truck is known for engine failures due to thin oil not reaching the cylinder heads and timing chain/phaser problems. 180,000 miles
2018 and 2011 Ecoboost V6 F150's, Honda EU2000, M1 10W-30 Extended performance
Lawn equipment, JD tractor and Kawasaki water pump: M1 5W-40 TDT (Turbo diesel Truck) or Rotella T6 of the same viscosity. Both oils are very similar.
390cc Subaru Generator M1, 15W-50. This thing runs hot and hard. 2500 hours so far, still runs great.