Will be select Wal-Mart stores that are featuring the world cup endcap with Valvoline oil and additives not all stores. Just an FYI! If you go on Wal-Marts site you can shop stores near you and it will let you know where it is available.
It's less about mileage and more fuel quality and driving habits. City/stop and go traffic is going to cause more deposits vs highway driving. Every 3-5k depending on driving habits should be fine.
Exactly correct. Limiting carbon buildup and excess deposits during combustion throughout the vehicles life is the best way to help keep the valves clean. The injector tip is also a large issue in DI engines as it's directly inside the combustion chamber and easily gets covered in carbon causing...
I cant give out much detail due to non-disclosure agreements, unfortunately. What I can say is our chemists work with some larger refineries to innovate top tier fuels and detergent packages and they are all slightly different... different enough that you would tell if you run one from another...