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DOMINATOR 20W-50 Competition Diesel Oil

Product code : DCOQT-EA
AMSOIL DOMINATOR® 20W-50 Competition Diesel Oil is designed for professionals and enthusiasts who want a step up in diesel protection. It is specifically designed for high-horsepower diesel engines and delivers the benefits most important to diesel competitors, including robust durability, outstanding bearing protection and the ability to withstand the extreme pressures and temperatures common to diesel competition. 


Availability and Price subject to AMSOIL stock, visit product's page for updated information.


  • Racing and high-performance diesel engines are modified to deliver maximum horsepower and torque. Their powerful designs create shearing forces that can cause oils to lose viscosity, leaving bearings, pistons and other components vulnerable to wear and failure. DOMINATOR 20W-50 Competition Diesel Oil delivers 50 percent more film thickness* to withstand high cylinder pressures and protect against wear. It is heavily fortified with zinc and phosphorus anti-wear additives to provide additional protection against scuffing and wear in severe conditions.

    *compared to the 3.5cP HTHS limit for SAE 15W-40

  • High-horsepower diesel engines push a lot of fuel, leading to fuel dilution. Fuel reduces the oil's viscosity. As the oil becomes thinner, it compromises the lubrication of critical components, increasing wear. DOMINATOR Competition Diesel Oil's robust formulation helps offset the damaging effects of fuel dilution by maintaining its protective viscosity longer.
  • Over time, turbos can suffer reduced performance or catastrophic failure. DOMINATOR Competition Diesel Oil is designed with an extremely durable 20W-50 synthetic formulation that contains maximum levels of oxidation-inhibitor additives to resist harmful oxidation and provide exceptional resistance to deposit formation, preserving turbocharger performance and life.
    • API CK-4, CJ-4, CI-4+, CH-4
    • Cummins 20081/20086
    • Mack EO-O/EOS-4.5
    • Volvo VDS3/VDS4/VDS4.5
    • Caterpillar ECF-2, ECF-3, ECF-1-a
    • Renault RLD-3/RLD-4
    • Chrysler MS 10902
    • Ford WSS-M2C171-F1
  • DOMINATOR 20W-50 Competition Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will shorten the oil's life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

    Aftermarket oil additives are not recommended for use with AMSOIL synthetic diesel oils.
  • DOMINATOR Competition Diesel Oil provides lasting protection for multiple events. Use oil analysis to determine appropriate drain interval.

    Note: When not competing, follow OEM1 drain intervals or extend drain intervals with oil analysis.

    1Refer to your owner's manual for OEM drain interval recommendations and guidelines for severe and normal service.

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