Quote:
Originally Posted by lewdog
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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Some of the Mazdaspeed guys that are in hotter climates run 5W30 when the manual calls for 5W20 because of the heat breakdown of the oil.
I run Rotella T6 in mine (the geeks that pay for oil analysis have convinced me that's the way to go for my motor).