Well... This is about as basic as it gets. I have been reading exactly "what" oil means and what the numbers mean. I tend to agree with what a lot of the descriptions say about people really not fully understanding what the numbers are on oil.
. Mostly because I had no idea myself (the book says use this so i use it). There I said it I DONT KNOW. well I did my research and am trying to fully understand all of it.
I know people are running different oil weights for things like oil coolers and turbos. BUT WHY. why do this. Turbos get oil hotter? Ok so use a thicker oil? well what about the engine specs from Toyota/Subaru? They say run 0w-20. now we have a oil cooler/turbo and we are running 0w-30. So we are increasing the Hot viscosity of the oil. Idk maybe I have been reading this explanations wrong. Heck I may be making it way more complicated than it really is. I am not asking what I should be running (yet). I am trying to understand the entire thing.
It may just be me but i think this would be a great write up for this section of the forum as a Sticky. Not trying to get flamed just trying to fully understand it.