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Question that hopefully Jason can answer but anyone else can chime in as well. The Stang has run Royal Purple 5W20 (recommended) in it it's whole life. I am changing the oil this weekend. I don't mind sticking with Royal Purple and probably will, but should I be using something other than the manufacture's recommendation of 5W20 since it's so hot here in Phoenix....maybe 5W30 instead since the oil thins at high temperatures anyway?
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