My 2013 2.7L specs 0W20 oil. According to manual, can run 5W20, and there is a statement that you can run heavier oil in severe conditions (towing, etc.). Not sure what that statement implies.....0W30 or 5W30 maybe???
So, my question is whether this is one of those engines where they spec'd 5W30 for years, then went to 0W20 just to try and meet some CAFE standard? The reason I ask, my daughter has an 2004 Camry that specs 5W30, and my dad has a 2010 with the same engine, but the later model specs 5W20.
0W20 is fine for winter, because my son will be taking the little Taco to school in snow country. But, it will spend its summers in the Southwest desert, where daily temps are extremely HOT. I was thinking of running minimum 5W20 in summer, simply because it takes fewer VII's (Viscosity Index Improvers) to turn a 5 weight oil into a 20 (when hot), than it does to turn a 0 weight into a 20. (In multi-viscosity oils, VII's are balls of plastic that unfold into threads when they get hot, to thicken the oil, but....they have no lubricating ability of their own and are the most labile part of an oil's additive package, so the less of them in your oil to start with....the better!)
Or....just run 5W30 in summer and not worry about it?
I run Redline polyol ester synthetic in everything, cars, trucks, ATV's, and motorcycles. http://www.redlineoil.com/content/fi...PDS%205-13.pdf