Additives

Get the most from your water-methanol injection kit with Boost Juice! Boost Juice is a proprietary mix of 49% methanol and 51% distilled water. Manufactured in the U.S.A in a controlled environment...

Max-Restore contains a high dose of polyether amine (PEA) & proprietary detergents that quickly clean stubborn, long-term deposits, often found in high mileage engines, that clog injectors and...

Royal Purple Max-Atomizer is a highly concentrated, high performance fuel injector cleaner. It is specially formulated to solve problems with today's direct injection engines, but can be used with...

Royal Purple Max-Boost is a high-performance octane booster and fuel treatment that increases gasoline octane, reduces emissions, and enhances engine performance while stabilizing fuel. Max-Boost is...

Royal Purple Max-Tane is formulated for year-round use in all types of light, medium and heavy duty diesel engines, and is compatible with any type or grade of diesel fuel, including #1 diesel and #2...

Royal Purple Break-In Oil is formulated to provide the critical wear protection needed by the engine valve train and camshaft while allowing new piston rings to quickly seat to the engine cylinder...

Add 1oz at a time to clutch-type limited slip or posi-traction units to eliminate chatter

Also cleans carburetor deposits and injectors, safe for catalytic converters

Cleans your carburetors or fuel injectors, fuel lines, tank, intake valves, combustion chambers and fouled plugs

1 bottle to 20 gallons of race gas showed a 1.5% increase in torque on the dyno

Motul 300ml Engine Clean Auto Additive

HiTest is a concentrated, metal-free octane booster designed to increase power by increasing octane number and combustion efficiency. The advanced formulation eliminates knocking by increasing the...