Originally Posted by Tmibiker
Is Rotella T-6 the best choice for NA applications too? I've heard a lot of really good things about it for WRXs, but I've not heard it specifically recommended for the NA EJ25s. Are there any compelling reasons I should switch from Mobil1 High Milage 10W30?
Don't listen to me, I'm just one guy on the internet. Do some searching on here and you'll get the general consensus.