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  DYNO PROVEN TO PROVIDE THE LARGEST POWER GAINS FOR THE 2001-09 GM DURAMAX TURBO DIESEL
 RPM OUTLET.COMSTRATEGY

In keeping with our goal of providing our customers with the best possible value, we have tested a large group of components specifically designed for the GM Duramax.

We have invested many hours evaluating and refining each of the GM Duramax products on our chassis “dyno”, to ensure that we could develop as much power as possible, as safely as possible.

The site menu on the left side of this page, lists the clear winners when it comes to “performance vs. dollar” value. Please check back often as we are always developing new ways to create more horsepower.



Oil, Lube, and Fluids

Why is Royal Purple superior to other motor oils?
Royal Purple Motor Oil is a blend of synthetic oils that aims to improve engine performance and protection, reduce emissions and increase fuel economy. Because it adheres to engine surfaces after shutdown, it provides protection during startup. Royal Purple claims its product also increases horsepower and torque while reducing wear and heat within the engine.

Royal Purple outperforms synthetic and conventional oils primarily due to its proprietary Synerlec technology and its superior, synthetic base oils. Synerlec significantly increases oil film strength to dramatically reduce friction and improve combustion. This translates into more horsepower and torque, improved fuel economy and reduced wear, heat and emissions.

What kind of performance gains can be expected?
Multiple independent university and automotive industry testing has documented these typical performance gains:

  • Fuel economy improvements of up to 5% or more.
  • Horsepower and torque increases of up to 3%.
  • Reductions in emissions of 20% or more.
  • Reductions in heat of up to 12%.
  • Reductions in wear of up to 80%.
  • Performance gains will vary depending on the type of vehicle, its condition and the way it’s driven.

Mouse over and Click-ON Link For Spicific Product Information

  • Automotive Engine Oils
  • Diesel Engine Oils
  • Auto Transmission Fluid
  • Power Steering Fluid
  • Differentials Gear Oil 75W-90
  • Differentials Gear Oil 85W-140
  • Manual Transmission Fluid
  • Auto Transmission Fluid
  • Radiator Coolant Additive






  • Automotive Engine Oils

    Royal Purple Motor Oil delivers superior protection and improves performance in four-cycle gasoline and diesel engines. It increases horsepower and torque, saves fuels and reduces heat, wear and emissions. Royal Purple Motor Oil unsurpassed oxidation stability that allows for extended oil drains and fewer oil changes, which saves you time and money and reduces the impact on the environment.

    Specially formulated for today's turbo and injected motors. Motors stay cleaner and cooler, resulting in better gas mileage, superior engine protection, and longer oil life. Now API certified.

    Royal Purple® Motor Oil is a tough, long life, high performance oil that delivers superior protection and enhanced performance to engines. It gains its performance advantages from a blend of synthetic oils plus Royal Purple's proprietary, synthetic Synerlec® additive technology.

    Synerlec® additive technology greatly reduces engine wear, including ring, cylinder and bearing wear. It is extremely tenacious, adheres to engine surfaces and remains after shutdown, which provides protection upon initial startup.

    Note: Royal Purple's motor oils are API certified and will not void new car warranties. Plus they are compatible with other mineral and synthetic motor oils.

      Royal Purple® synthetic Motor Oil Advantages:

    • Greater Wear Protection
    • Greatly Extends Oil Drain Intervals
    • Superior Corrosion Protection
    • Saves Fuel Reduces Exhaust Emissions
    • Increases Horsepower
    • Keeps Engines Clean Will Not Harm Seals
    • API Warranty Approved
    • Environmentally Responsible
    Item #: ROY-01520
    5W-20 Synthetic Oil
    $ 6.75


    Item #: ROY-01530

    5W-30 Synthetic Oil
    $ 6.75


    Item #: ROY-01130

    10W-30 Synthetic Oil
    $ 6.75





    Automotive Diesel Engine Oils


    Royal Purple Motor Oil delivers superior protection and improves performance in four-cycle diesel engines. It increases horsepower and torque, saves fuels and reduces heat, wear and emissions. Royal Purple Motor Oil unsurpassed oxidation stability that allows for extended oil drains and fewer oil changes, which saves you time and money and reduces the impact on the environment.

    Specially formulated for today's turbo and injected motors. Motors stay cleaner and cooler, resulting in better gas mileage, superior engine protection, and longer oil life. Now API certified.

    Royal Purple® Motor Oil is a tough, long life, high performance oil that delivers superior protection and enhanced performance to engines. It gains its performance advantages from a blend of synthetic oils plus Royal Purple's proprietary, synthetic Synerlec® additive technology.

    Synerlec® additive technology greatly reduces engine wear, including ring, cylinder and bearing wear. It is extremely tenacious, adheres to engine surfaces and remains after shutdown, which provides protection upon initial startup.

    Note: Royal Purple's motor oils are API certified and will not void new car warranties. Plus they are compatible with other mineral and synthetic motor oils.

      Royal Purple® synthetic Motor Oil Advantages:

    • Greater Wear Protection
    • Greatly Extends Oil Drain Intervals
    • Superior Corrosion Protection
    • Saves Fuel Reduces Exhaust Emissions
    • Increases Horsepower
    • Keeps Engines Clean Will Not Harm Seals
    • API Warranty Approved
    • Environmentally Responsible
    Item #: ROY-01130
    10W-30 Synthetic Oil
    $ 6.75


    Item #: ROY-01154

    15W-40 Synthetic Oil
    $ 6.75





    Max ATF® Transmission Fluid


    Max ATF® is a synthetic, high performance, long life, multipurpose, transmission fluid and is recommended for all transmissions requiring Ford Mercon® or GM Dexron® III transmission fluids. This includes the automatic as well as the manual transmissions in late model Mustangs.

    Max ATF® significantly reduces heat to extend the life of your transmission. Automatic transmissions generate a great deal of heat and depend upon the transmission fluid for cooling and protection. More than 90 percent of all automatic transmission failures are caused by overheating; a 20°F reduction in fluid temperature can double the life of the transmission (Source: Perma Industries, Inc.).

    Max ATF® is fully compatible and can be mixed with other automatic transmission fluids; however, for the best results drain or flush the current oil and then fill with Max ATF.

      Max ATF® Transmission Fluid Advantages:

    • Greater Wear Protection
    • Increases Fluid Life
    • Promotes Clean, Efficient Equipment
    • Extends Equipment Life
    • Increases Oil Life
    • Provides Outstanding Rust / Corrosion Protection
    • Promotes Smoother Shifting
    • Reduces Temperatures
    Item #: ROY-01320

    $ 8.75









    Max EZ® Power Steering Fluid


    Max EZ® is an advanced power steering fluid designed to maximize the life and performance of all power steering units.

    Max EZ® is formulated with a blend of select synthetic base oils plus Royal Purple’s proprietary Synerlec® additive technology, which is proven to make equipment run cooler, smoother, longer, quieter and more efficiently.

    Max EZ® is compatible and can be mixed with conventional power steering fluids and has excellent seal compatibility. Try Royal Purple® Max EZ® today and Feel the Difference!

      Max EZ® Power Steering Fluid Advantages:

    • Greater Wear Protection
    • Severe Service Performance
    • Lower Coefficient of Friction
    • Shock Load Protection
    • Compatible with Other Oils
    • Meets Warranty Requirements
    Item #: ROY-01326

    $ 4.75





    MaxGear® Gear Oil


    MaxGear® is an ultra-tough automotive gear oil. It’s designed to maximize power and provide unsurpassed protection to heavily loaded gears. It makes gears run smoother, quieter, cooler and longer without overhauls.

    MaxGear® outperforms other gear oils because it combines the highest quality synthetic oils with Royal Purple’s proprietary Synslide additive technology.

    MaxGear® is recommended for use in truck, motor home / RV, and automotive front or rear differentials, manual transmissions, and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. All viscosities of Max-Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary.

    Note: All viscosities of Max-Gear® are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary.

      MaxGear® Performance Advantages:

    • Greater Wear Protection
    • Severe Service Performance
    • Lower Coefficient of Friction
    • High Temperature Performance
    • Low Temperature Fluidity
    • Shock Load Protection
    • Compatible with Other Oils
    • Meets Warranty Requirements
    Item #: ROY-01300
    75W-90 Synthetic Max
    $ 14.75


    P/N : ROY-01303

    85W-140 Synthetic Max
    $ 14.75





    Synchromax®


    New from Royal Purple...Synchromax® Manual Transmission Fluid. Synchromax® is recommended for manual transmissions that specify an automatic transmission fluid or motor oil. (ie: Tremic TKO) that require either an automatic transmission fluid, multi-viscosity motor oil or straight grade motor oil. It is also ideal for 2-cycle motorcycle gear boxes.

    Feel the difference. It is also ideal for 4x4 transfer cases and/or 2-cycle motorcycle gear boxes. Synchromax® is formulated with Royal Purple's synthetic, proprietary Synerlec additive technology, which offers improved shift quality over a wide temperature range and reduced gear noise. It is fully compatible with all types of friction materials, and offers excellent corrosion and oxidation protection, without affecting the soft metals commonly found in manual transmission synchronizers.

      Synchromax® Performance Advantages:

    • Greater Wear Protection
    • Promotes Smoother Shifts
    • Provides Excellent Rust / Corrosion Protection
    • Reduces Friction for More Power
    • Lowers Operating Temperatures
    • Works in both Gasoline and Diesel Tansmissions
    Item #: ROY-01512

    $ 12.75





    Purple Ice®


    Purple Ice® is a high performance, synthetic, radiator coolant additive for both gasoline and diesel engines. It is formulated to reduce the surface tension of the coolant, which improves heat transfer through the cooling system while providing additional protection against rust, corrosion and erosion.

    Purple Ice® prevents the formation of scale deposits in the radiator for optimum coolant flow and lubricates the seals of the water pump. It is ideal for use in straight water racing applications or in antifreeze / water mixtures.

    Purple Ice® is compatible with traditional ethylene glycol antifreeze (green) and GM Dex-Cool® antifreeze coolants. Purple Ice should not be used in new radiators until anti-freeze has been cycled through the

      Purple Ice® Performance Advantages:

    • Reduces Coolant Tension
    • Reduces Coolant Temperatures
    • Protects Aluminum Cooling Systems
    • Lubricates Water Pump Seals
    • Provides Corrosion Resistance
    • Passes ASTM Corrosion Tests
    • Works in both Gasoline and Diesel Engines
    Item #: ROY-01600

    $ 11.75



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