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Personally, if I was living in your area (I live in a similar hi heat area in Central California), I'd be running 20W-50 or straight 50W in a vintage inliner during the summer...
IMO, synthetics are great for modern tightly sealed, computer controlled engines but with our old, loose, mediocre sealed Pony engines, I personally think it's a waste of money, at least for a pure synthetic which is pretty expensive IME.
Running a good coolant package, overflow recovery and 13-16 lb radiator cap can also help with hot weather reliability.
Stay cool man!
IMO, synthetics are great for modern tightly sealed, computer controlled engines but with our old, loose, mediocre sealed Pony engines, I personally think it's a waste of money, at least for a pure synthetic which is pretty expensive IME.
Running a good coolant package, overflow recovery and 13-16 lb radiator cap can also help with hot weather reliability.
Stay cool man!
