The bigger the viscosity spread of a given oil the more crap it has in it that plays little if any part in the oil having excellent lubrication properties and film strength..
I would run a 10w30 year round and during the Summer change the filter so you have room to add a Qt bottle of Lucus oil additive.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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