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FWIW...I don't consider myself a "5w-20 lover". I do use it in my new Mazda mostly because I don't want any hassle should a warranty issue arise. I used mostly a 5w-30 (Chevron Supreme or Havoline) in my '01 F150 because when I purchased it, 5w-20 was pretty tough to come by locally. I did one UOA with the Chevron Supreme and it showed excellent results so I stuck with it. Wouldn't you know, when I had the truck into the dealer for a cold start problem the first thing they did was drain the oil, put in Motorcraft 5w-20 and note on the service slip that non Ford spec motor oil was being used. Potential warranty hassles is why I'll give 5w-20 the benefit of the doubt until I have good reason not to. When I do a few UOA on my car if the results aren't what I hope for then I may indeed switch to a 30w. I really have no personal bias towards either.