I know Synthetic is the best for any engine, and for the 5.7L engine. This is the easy part.
However, should I use 5w-20 Synthetic or 0w-20 (which only comes in Synthetic because only man can make it that thin)? I am from MN and so we have 4 seasons which includes cold temps as well as very hot temperatures. I also tow boats a few times per month during Spring, Summer, and Fall.
I was thinking about rotating oil but I am unsure if it would be bad for my 5.7L Toyota engine. What I meant is use 0w-20 in the Fall/Winter time and switch to 5w-20 Full Synthetic for the Spring and Summer time. What do you guys think on doing that?
If I was going to stick to just one oil all year, maybe 0W-20? But, will 0W-20 cause engine to run too hot in the summer time? Thoughts?