Curious to see what others are doing.
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Yea, my owners manual actually suggests Castrol 20/50. I've run this forever and never had a wear related problem. I'm in central cal. the weather is pretty mild except summers that are brutal. 100 + F.20w 50 in all 4. 2 - F engines and 2 - 2f engines.
I use 20W-50 also. Since reading up here (and elsewhere) on the reduced Zinc additives in modern motor oils and the resultant accelerated camshaft wear on flat-tappet motors like the F-series, I started using Valvoline Racing 20W-50 since it specifically has high ZDDP concentration for flat-tappet engines.