I did a search on Shell V Power system cleaner and there's a few older post and not much really said here compared to MMO, Techron, Gumout Regane.... Here we are today older, wiser, more experienced. Whats the scoop on Shell V Power system cleaner ? Is it being replaced by Gumout Regane (both are Shell products) and only being used in Shell gas ? Big Lots has Shell V Power system clearner for $2.00, is it worth that ? They have two different types, one says use every 3,000 miles and the other says use every 5,000 miles, both treat 20 gal. gas.