Originally Posted By: OVERKILL
Originally Posted By: Volv04Life
None of these answers are helping me. I need to know if anyone would use either T5 or T6.
No, if anything I'd use an oil like Mobil 1 0w-40 if you just have to deviate from the OEM spec. It is designed for high performance (and turbocharged) gasoline engines and has numerous Euro approvals for exactly that: durability and performance in this type of engine.
Despite the inevitability of this recommendation it is nearly perfect for this application.
It's a bit lighter than the typical 40w, cheap and plentiful, seems nearly perfect to me...