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Where I live in Wyoming see temperatures well below zero with wind chills at -30 and -40F. In the summer it can get in the 100's for a week, but is usually in the high 90's. Will using 0W20 in the summer be the best thing or should I use 0W20 in the winter and switch to 5W20 in the summer? My...

Originally Posted By: NHSilverado Run what the mfg calls for as far as weight goes. You are still under waranty and Toyota is a bear when it comes to stuff like that. Toyota recommends both 0W20 and 5W20 for the 5.7L and I was just looking for recommendations on which one to use and the best...

Originally Posted By: Bulli Amsoil 0-20 M1 0-20 or M1 5-20 PP5-20 Doesn't PP come in a 0W20? Is there any reason you recommend the PP 5W20, but not the 0W20?

I am looking for opinions on using either 0W20 or 5W20 in my 2007 Toyota Tundra 5.7L and what oil would be the best for this engine. I live in Wyoming and see temperature extremes on both ends. Thanks for your input.