Just tripped 5000 miles on the odometer last week an added a bottle of Chevron TECHRON to 15 gallons of fuel for my SFS 2.0T. No noticeable change in performance or engine smoothness as thing is purring like a kitten anyway. Are any of you other folks using this additive or are you getting an additive for the Dealer or what? Just curious. Do not wish to mess up my warranty.