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Engine & Fuel Systems

STP® has everything you need to keep your car running to its full potential. Explore STP® engine and fuel system products from fuel and oil additives to octane boosters, motor oil and more.

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STP Fuel, Exhaust & Emissions System Cleaner

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Engine & Fuel Systems

STP Fuel, Exhaust & Emissions System Cleaner

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STP GDI Intake Valve Cleaner

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Engine & Fuel Systems

STP GDI Intake Valve Cleaner

STP® 1 Tank Tune Up

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Engine & Fuel Systems

STP® 1 Tank Tune Up

Ultra 5-In-1 Fuel System Cleaner

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Engine & Fuel Systems

Ultra 5-In-1 Fuel System Cleaner

Super Concentrated Fuel Injector Cleaner

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Engine & Fuel Systems

Super Concentrated Fuel Injector Cleaner

Gas Treatment

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Engine & Fuel Systems

Gas Treatment

Oil Treatment

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Engine & Fuel Systems

Oil Treatment

Complete Fuel System Cleaner

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Engine & Fuel Systems

Complete Fuel System Cleaner

Octane Booster

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Engine & Fuel Systems

Octane Booster

High Mileage Oil Treatment + Stop Leak

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Engine & Fuel Systems

High Mileage Oil Treatment + Stop Leak

Synthetic Oil Treatment

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Engine & Fuel Systems

Synthetic Oil Treatment

High Mileage Fuel Injector Carburetor Treatment

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Engine & Fuel Systems

High Mileage Fuel Injector Carburetor Treatment

PRO Performance Motor Oil

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Engine & Fuel Systems

PRO Performance Motor Oil

SYN Full Synthetic Motor Oil

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Engine & Fuel Systems

SYN Full Synthetic Motor Oil

Synthetic Engine Flush

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Engine & Fuel Systems

Synthetic Engine Flush

Super Concentrated High Mileage Engine Flush

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Engine & Fuel Systems

Super Concentrated High Mileage Engine Flush

STOP LEAK + STOP SMOKE ENGINE REPAIR

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Engine & Fuel Systems

STOP LEAK + STOP SMOKE ENGINE REPAIR

All Season Water Remover

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Engine & Fuel Systems

All Season Water Remover

High Mileage Complete Fuel System Cleaner

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Engine & Fuel Systems

High Mileage Complete Fuel System Cleaner

Fuel System Cleaner for Ethanol

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Engine & Fuel Systems

Fuel System Cleaner for Ethanol

Diesel Fuel Injector Treatment

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Engine & Fuel Systems

Diesel Fuel Injector Treatment