STP 78568-12PK Complete Fuel System Cleaner - 5.25 fl. oz. (case of 12)

I was confused why the small bottle treated almost as many gallons as the larger bottle so I called STP. According to them it is a slightly stronger concentration of cleaning agent vs. the larger bottle. However this is the old spec, they have recently changed the concentration so going forward the small bottles listed in this product page will only treat up to 15 gallons. So if you do purchase make sure when you get the bottles you check to treatment listed to see which concentration you received. The ones I got were the previous generation treating up to 21 gallons which works for me.

😲Now that we're Energy Dependent again,... I can no longer afford to fuel up with Costco Premium Detergent Gasoline (Cleaner for the Environment) instead, I have to use "Regular" (Worse for the Environment) >> ADD a bottle of STP Fuel System Cleaner at this price, and it's like putting in Premium Gas >> HINT: ADD contents to the tank BEFORE you fuel up. The incoming stream will "mix" the contents into the tank for you. Adding the additive AFTER you fuel up, and it sits on top of the volume. Driving may agitate the mix for you, but probably not enough to be consistent.

Product was delivered on time and undamaged.

Works great in my old truck

Product - 1 of 12 in a box was damaged and leaked all over the box and other items. Would like a replacement bottle since I paid for it, but I says it is not available to return or replace. That seems crazy.