Royal Purple Max-Clean Fuel System Cleaner & Stabilizer — 20 oz, Case of 6, Cleans Injectors and Restores Economy

Royal Purple Max-Clean is an all-in-one fuel system treatment that cleans injectors, stabilizes fuel, and helps restore lost fuel economy and performance.

Max-Clean targets deposits throughout the intake and combustion areas to reduce buildup that robs power and efficiency. Designed for gasoline and diesel engines — from older naturally aspirated motors to modern turbocharged units — this concentrated formula works in a single treatment to dissolve varnish, carbon, and sludge that accumulate from normal combustion. Independent fleet testing showed average gains in fuel economy and horsepower after use, and measurable drops in common exhaust emissions.

How quickly will I see results after using Max-Clean?

Many users notice smoother running and reduced hesitation after a single treatment, while fuel economy and power improvements are often measurable after one fill-up or two. Results depend on the level of existing deposit buildup and driving conditions, but the formula is made to work on short and long trips alike.

• Works in one treatment for many vehicles
• Visible drivability improvement on most engines quickly
• Full fuel-economy gains may appear across a few driving cycles

Will Max-Clean work in my gasoline or diesel engine?

Yes — the formula is engineered to be effective across the full spectrum of engine types, including gasoline and diesel, turbocharged or supercharged, and both new and high-mileage units. It safely treats fuel injectors, intake valves, and combustion chambers without modifying factory systems.

• Compatible with gasoline and diesel fuels
• Safe for forced-induction and naturally aspirated engines
• Suitable for new vehicles and older, higher-mileage engines

What specific performance and emissions benefits can I expect?

Fleet testing indicates average improvements: modest but meaningful increases in fuel economy and horsepower, plus reductions in common exhaust pollutants. The cleaner combustion and reduced deposits also help prevent rough idle, stalling, and premature spark plug fouling — improving reliability as well as efficiency.

• Average fuel-economy improvement reported in tests
• Average horsepower increase measured after treatment
• Lower hydrocarbon, NOx and CO emissions on average

How do I use Max-Clean for best results?

Treat one full tank with the recommended dose of Max-Clean and drive normally to allow the formula to circulate and act on deposits. For heavily fouled systems, a follow-up treatment may provide additional benefit. Always follow label directions and safety guidelines when adding treatments to fuel.

• Add directly to a full fuel tank per the product label
• Drive as usual to let the treatment clean the system
• Repeat service as recommended for maintenance or severe buildup

Who is this for? Royal Purple Max-Clean is intended for vehicle owners, fleet managers, and performance enthusiasts who want a convenient, concentrated solution to remove fuel-system deposits and improve efficiency. It’s useful for anyone maintaining modern engines, reviving higher-mileage vehicles, or seeking incremental gains in economy and drivability without engine modifications. Sold here as a case of six 20 oz bottles, it’s a practical choice for workshops, fleets, or owners who prefer to keep multiple treatments on hand.