
Royal Purple's Max-Clean Fuel System Cleaner is a popular product among car enthusiasts, with many swearing by its ability to improve engine performance and fuel economy. The product claims to clean injectors, carburetors, intake valves, and combustion chambers, resulting in smoother idling, quicker response, and improved fuel efficiency. However, some car owners remain skeptical about the effectiveness of fuel additives, arguing that high-quality fuel is sufficient to maintain optimal engine performance. Royal Purple recommends using their fuel injector cleaner at every fill-up, with a minimum of once every 3,000 miles, and for maximum effectiveness, a dose of one 6oz. bottle per 10 gallons of fuel is advised.
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What You'll Learn
- Max-Clean® Fuel System Cleaner by Royal Purple improves engine performance
- Max-Atomizer™ Fuel Injector Cleaner by Royal Purple improves fuel economy
- Max-Clean® stabilizes fuel during low-use and storage periods
- Max-Clean® should be used every 10,000 miles or annually
- Max-Atomizer™ is recommended for use at every fill-up

Max-Clean® Fuel System Cleaner by Royal Purple improves engine performance
Royal Purple's Max-Clean is a state-of-the-art synthetic fuel system cleaner and fuel injector cleaner. It is designed to deeply penetrate and clean injectors, carburetors, intake valves, and combustion chambers, thereby restoring fuel economy and reducing emissions.
Max-Clean's unique formula stabilizes fuel, especially during low-use and storage periods, preventing the formation of gums and varnish that can damage your engine. This fuel stabilizer works in tandem with detergents to maintain total engine cleanliness. By delaying or preventing the onset of oxidation, Max-Clean reduces the clean-up burden of fuel detergents, resulting in fewer deposits and a cleaner engine.
The product is easy to use. Simply pour the entire contents of the 20 oz. can into a nearly empty tank and then refuel. One can treats up to 20 gallons of fuel. For tank sizes outside of this range, use one ounce per gallon. For two-cycle engines, use one ounce per gallon. It is recommended to use Max-Clean every 10,000 miles or annually, whichever comes first.
Customers have reported significant improvements in engine performance, including increased fuel efficiency, improved acceleration, and smoother throttle response. Many have noticed a boost in power and a reduction in engine noise, with some even seeing an increase of up to 2 miles per gallon. Max-Clean has also been shown to effectively remove tough combustion chamber deposits, optimizing performance and preventing engine damage.
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Max-Atomizer™ Fuel Injector Cleaner by Royal Purple improves fuel economy
Royal Purple's Max-Atomizer is a fully-synthetic, 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 any type of fuel injection. Max Atomizer contains highly concentrated polyether amine (PEA) detergents that quickly clean clogged and coked injectors, restoring 100% of injector flow. This optimizes injector spray patterns and better atomizes fuel as it enters the combustion chamber.
The result is improved fuel economy, enhanced power and performance, reduced emissions, smoother idle, and quicker/easier starts. Customers have reported improvements in early-on acceleration, faster pick-up, smoother idling, quicker starts, better fuel economy, and improved responsiveness. One customer reported that their MPG "climbs up faster and stays there longer". Another customer reported that their engine was "smoother revving and mpg's went up by 2-4".
Fuel economy is reduced when deposits are formed on injector nozzles. Modern engines have injector nozzles with a higher quantity of smaller holes. This reduces fuel droplet size and better atomizes fuel sprayed into combustion chambers. However, smaller nozzle holes also clog more easily, especially in GDI engines that are more deposit-prone. Reduced fuel atomization causes a loss of power and fuel economy and increases emissions.
Max-Atomizer removes injector deposits and restores optimal injector atomization when tested in BMW GDI turbo engines. It is the only fuel injector cleaner that also stabilizes ethanol, which chemically breaks down to cause harmful effects to an engine. It is recommended that Max-Atomizer is used at every fill-up, with a minimum of every 3,000 miles.
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Max-Clean® stabilizes fuel during low-use and storage periods
Royal Purple's Max-Clean is a state-of-the-art synthetic fuel system cleaner and fuel injector cleaner. It is designed to maximize the performance of your fuel system by restoring fuel economy and reducing emissions. Max-Clean is particularly effective at stabilizing fuel during low-use and storage periods, preventing the varnishing of fuel. This is achieved by delaying or preventing the oxidation of hydrocarbons in the fuel, which reduces the formation of gums and deposits that can build up on engine surfaces.
To use Max-Clean, simply pour the entire contents of the bottle into a nearly empty tank immediately before refueling. One can treats up to 20 gallons, and for tank sizes outside of this range, you can use one ounce per gallon. For two-cycle engines, the recommended dosage is one ounce per gallon. It is recommended to use Max-Clean every 10,000 miles or annually, whichever comes first.
Max-Clean's ability to stabilize fuel during low-use and storage periods is beneficial for several reasons. Firstly, it helps prevent the formation of Intake Valve Deposits (IVDs) and Combustion Chamber Deposits (CCDs). IVDs are caused by oil seeping past the intake valve guide seals and carbon deposits forming on the valves. CCDs increase the compression ratio of an engine and the octane requirements of the fuel, which can lead to detonation and engine damage if not addressed. By stabilizing the fuel and reducing deposit formation, Max-Clean helps prevent these issues and optimizes engine performance.
Additionally, Max-Clean's fuel stabilization properties can lead to improved fuel economy and reduced emissions. By preventing the formation of gums and deposits, Max-Clean helps maintain smooth engine operation and efficient fuel combustion. This, in turn, can result in improved fuel efficiency and reduced emissions of harmful substances such as hydrocarbons, nitrogen oxide (NOx), and carbon monoxide (CO). Overall, Max-Clean's fuel stabilization capabilities make it an effective tool for maintaining engine cleanliness, performance, and efficiency, even during periods of low vehicle use or storage.
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Max-Clean® should be used every 10,000 miles or annually
Royal Purple's Max-Clean Fuel System Cleaner is a fuel injector cleaner that should be used every 10,000 miles or annually, whichever comes first. It is a synthetic fuel system cleaner that deeply penetrates and cleans injectors, carburetors, intake valves, and combustion chambers to restore fuel economy and performance.
Max-Clean is designed to prevent and remove deposits that can build up in your engine, causing reduced performance and fuel economy. These deposits, known as Intake Valve Deposits (IVD's) and Combustion Chamber Deposits (CCD's), can restrict airflow into cylinders, leading to a loss of power and fuel efficiency. By using Max-Clean regularly, you can prevent and remove these deposits, optimizing your vehicle's performance.
The product also stabilizes fuel during low-use and storage periods, preventing it from varnishing. This is especially beneficial for vehicles that are not driven frequently or stored for extended periods. By stabilizing the fuel, Max-Clean helps prevent the formation of gums and deposits that can occur during idle or storage periods.
To use Max-Clean, simply pour the entire contents of the bottle into a nearly empty tank immediately before refueling. One bottle treats up to 20 gallons of fuel. For larger or smaller tank sizes, use one ounce of Max-Clean per gallon of fuel. By following this maintenance schedule and using Max-Clean as directed, you can help keep your fuel injectors clean and maintain the performance and fuel efficiency of your vehicle.
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Max-Atomizer™ is recommended for use at every fill-up
Royal Purple's Max-Atomizer™ Fuel Injector Cleaner is a highly effective product that improves fuel economy, enhances idling, and delivers quicker acceleration. While some users have noticed improvements within 20 to 100 miles, it is recommended for optimal results that Max-Atomizer™ be used at every fill-up.
Using Max-Atomizer™ at each refuelling session ensures consistent and continuous engine maintenance. Injector deposits can quickly accumulate in modern Gasoline Direct Injection (GDI) engines because the injectors are located in the combustion chambers, which operate at extremely high temperatures. This high-temperature environment causes deposits to bake onto the injector nozzles, making them challenging to remove. Even a small amount of buildup on the injector tips can hinder the optimal atomization of fuel, leading to reduced engine performance and fuel economy.
By using Max-Atomizer™ at every fill-up, you can stay ahead of these deposit formations. The product's high flash point allows it to remain in the hot combustion chambers longer than competing products, resulting in more effective deposit removal. This means that you can maintain optimal injector flow rates and engine performance while also reducing emissions.
Additionally, Max-Atomizer™ is easy to use. Simply pour the entire contents of one 6oz. bottle into your nearly empty tank immediately before refuelling, then add fuel on top of the additive. This treatment is suitable for up to 20 gallons of fuel. For larger tanks, use one ounce of Max-Atomizer™ per gallon of fuel. For the best results, use Max-Atomizer™ at every fill-up and a minimum of every 3,000 miles.
Max-Atomizer™ Fuel Injector Cleaner is a reliable and efficient solution to maintain your vehicle's performance and fuel economy. By using it at every fill-up, you can ensure your engine runs smoothly and efficiently, saving you potential future costs and headaches associated with deposit buildup.
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Frequently asked questions
It is recommended to use the Royal Purple Fuel Injector Cleaner at every fill-up. The minimum recommended usage is every 3,000 miles.
The minimum recommended dose is one 6oz. bottle to 20 gallons of fuel. The maximum effective dose is one 6oz. bottle to 10 gallons of fuel.
The Royal Purple Fuel Injector Cleaner improves fuel economy, smoother idling, and quicker response. It also helps to remove injector deposits, which can cause performance loss and reduced fuel economy.











































