Once you go beyond price, location and bathroom cleanliness, does where you fuel up really matter? It actually can, explains Zachary J. Santner, senior specialist of quality at Sunoco. Fuel Matters: The top end of an engine can be a dirty, sludgy place, especially once you add crankcase gases to the mix. That mist of blow-by and oil vapors present inside the crankcase? Unless the car is really old or something has been modified, it sends that dirty air back into the combustion chamber.
