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?
is the engine consuming it??? NO...keep using what ya using now
do ya wanna go to a 10k mile oil change interval(NOT kidding)?? YES....switch to the t6
those are, really, the only reasons to switch...if ya gonna dump perfectly good oil every 3k miles....done even think of using the t6
you could likely even run the t6 to 15k miles if you change the fiter at 7k -8k miles and top it off, as necessary
that would make it cost effective to use it