Originally Posted by Shannow
Originally Posted by Jimmy_Russells
I'm sure CAFE is part of it but they switched in 2013/2014 to 5w20 to get more cooling over the valvetrain, excess heat was suspected as to why the 2012's had issues..
More cooling to the valvetrain ?
Got evidence of ths, it appears to be wild supposition...in an engineering sense.
There's no official public document if that's what you're asking, but they're not going to release something like that unless they want a class-action, of course. It seems awfully odd to me to set an engine up with 5w30, have some issues, and then change it to 5w20 a year later. If it was CAFE they would just do it in the first place, no?