In a new car, if you run a maintenance dose of let’s say Redline S-1 EVERY fill up. Would you ever need to do a full bottle treatment again? In a used car, once you run a full treatment of something like Redline S-1 or Techron, then you run a maintenance dose of let’s say Redline S-1 EVERY fill up. Would you ever need to do a full bottle treatment again? I personally do a maintenance dose every fill up with Redline S-1 and every other fill up a maintenance dose of MMO in both my vehicles.