I realize it isn't your personal recommendation, but I'd rather not take advice from oil change places that aren't full service garages. One quick lube wanted to put 10W-40 in my water cooled VW, which VW prohibited above about 50F. The engine needed straight 40 for summer, which wasn't available. Actually I typically used 20W-50, as VW dealers did, but even that wasn't recommended above about 78F.