Advance Auto Parts offers two STP 5.3-oz. Super Concentrated Fuel Injector Cleaner 2-Packs
. (Add two 2-packs to cart.) Opt for free in-store pickup
to dodge the $8.66 shipping fee. That's $2 per bottle, a saving of $8, and the lowest price we could find for this quantity. Sales tax is added where applicable. This cleaning fluid contains concentrated detergents that help dissolve and remove harmful carbon, gum, and varnish deposits on fuel injectors.