High Mileage STP Its mostly a vicosity booster which you should be able to buy in your regular oil,it has some stop leak additives for seals and some added zinc.If you choose the right oil you shouldnt need any of these this forum is not a fan of STP lol. Which i cant blame them the last time i used it in the 90's in an old pontiac 400 as much stayed in the can as went into the engine lol. I did pick up some STP 4 cyl treatment at menards with zinc for 1.99 a bottle i only use 1/2 a bottle per oil change to boost my zinc a little more until someone has this new defy tested to see if its needed.Basically you should buy the right oil your engine needs the first time buying these additives is just a waste of money use your head.If your car is leaking oil use High Mileage oil if it needs extra zinc buy what is needed etc etc ...
