Originally Posted by short_round
It is not wise to Rotella T6 5w-40 in a N/A engine no matter what. I personelly use Rotella T6 5w-40 in my 1992 Legacy SS turbo with no issues at all and use it in 2006 STi again no problems.
Can I ask why? Again I had heard this before, just curious if you have the knowledge I am seeking, I also ran t6 in my WRX and it was great.