Without cleaning, deposits can lead to hard starts, lost acceleration and rough idling.  STP Fuel Injector & Carburetor Treatment + Upper Cylinder Lubricant is specially formulated to maintain clean performance of fuel injectors and carburetors by helping to prevent the accumulation of deposits. It’s made with jet fuel, a high-quality carrier of active ingredients. Cap-less compatible.
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Lawrence N. –
My car became super smooth after using this.
Good Quality and affordable.
Jim –
An awesome product. Works well at the recommended dilution levels. Try 2 to 3 bottles and a couple of tankful to really appreciate the difference.
Monique K. –
Maintains smooth fuel injection in old cylinder/engine.