STP Pro Series Intake Valve Cleaner

STP Pro Series Intake Valve Cleaner is an aromatic solvent aerosol sprayed into the air intake tract while the engine runs at elevated idle. The chemistry dissolves carbon deposits on intake valves · the mechanism relevant for direct-injection engines, where fuel injection bypasses the intake tract and allows carbon to accumulate on valve faces over time. According to the manufacturer, coverage extends to the combustion chamber. No dedicated detergent active was identified in the SDS; this is a solvent-dissolution approach rather than a deposit-prevention treatment. One 20 oz can is a single application.

Best for direct-injection engine owners · Ford EcoBoost, GM 2.0T, Toyota Dynamic Force, and similar · with rough idle or hesitation symptoms consistent with intake valve carbon buildup after 50,000+ miles. Port-injected engine owners get little benefit; fuel wash keeps intake valves clean naturally. Not a substitute for professional walnut-blast service on heavily carbonized engines, or for Top Tier fuel discipline as a prevention strategy.

DANGER signal word driven by H332 (harmful if inhaled) and Prop 65-listed aromatic solvent components. SDS §8 directs eye protection, protective gloves, and respiratory equipment during spraying · the H332 inhalation hazard is active at the spray step. The product combusts in the engine · exhaust byproducts are the environmental endpoint.