Engine, Power, and Performance
My 2007 Subaru has error codes P0016 , P0018 , P0021 , P0028 , P0128
I replaced the oil with 5w-30 which is what the oil cup read I used a high mileage (non synthetic if that matters) and well as a new oil filter.
I also replaced the intake valve solenoid on the drivers side.
And put some...