I've seen a lot of avocation for the usual oil weights and blah blah blah.
Has anyone used HD40 during the summer in your wheeler EA's?
I'm liking the idea, we run steady high rpm's, idle for long periods of time, and don't shut the vehicles down. Everything the oil is designed for.
SAE40 is on the recommended weight list from Subaru by the way, for above 60F.