AMSOIL Dominator Synthetic 15W-50 Racing OilA professional formula synthetic racing oil suitable for engines requiring a 15W-50 or 20W-50 motor oil.  A powerful synthetic oil that fights wear and extreme heat, while maximizing horsepower output. Contains 1575 ppm zinc and 1424 ppm phosphorus for excellent flat tappet camshaft protection.

Dominator Synthetic 15W-50 Racing Oil package sizes include:
1-US Quart Bottles (or buy case of 12)
1-US Gallon Bottles (or buy case of 4)
55-US Gallon Drum

Request a Canadian or US wholesale price list using the contact form on this page.

If your racing or high-horsepower muscle car engine requires 15W-50 or 20W-50 engine oil, then you likely require serious wear protection. You make no compromises when it comes to adding parts to your car and engine oil should be no different. AMSOIL Dominator Synthetic 15W-50 Racing Oil is formulated with the most elite synthetic base oils and the most robust additives available to combat wear, deliver cooler operation and optimize power delivery. Dominator Synthetic 15W-50 is not just an engine oil, it is wear insurance and a performance upgrade.

Oil Designed for the Long Haul

AMSOIL Dominator Synthetic 20W-50 Racing Oil Four-Ball Wear TestYour race days may be an endurance test and Dominator Synthetic 15W-50 Racing Oil is designed to go the distance. Formulated with a shear-stable base oil as well as massive doses of zinc and phosphorus, Dominator will withstand extended periods of enormous shock loads and extreme heat. Regardless of how long your event may be, this oil will be delivering the steady protection when the checkers fly. Racing is unpredictable, but engine oil related failure can be taken out of the equation when you switch to Dominator.

Improve Power Delivery and Cooler Operation

AMSOIL Dominator Synthetic 15W-50 Racing Oil is designed to diminish friction which offers a few significant benefits.  As expected, power and torque output are optimized which helps your game, but an equally important is the cooler operating temps that friction reduction can provide. This allows for consistent, all day performance and extended component life.

Engine Start Protection

The first few moments that a racing engine is fired up can be the time that it is most vulnerable to wear. A concern with many 50 weight oils is that they may pump sluggishly upon ignition. AMSOIL Dominator Synthetic 15W-50 Racing Oil flows instantly for immediate protection of all engine components.

Enjoy the Same Formula We Supply to the Pros

Unlike other racing oil makers, the Dominator Synthetic Racing Oil series is the exact formula that we supply to AMSOIL-sponsored racers. We do not have “works” racing oil formulas for the professionals, so rest assured that you are getting the same performance and protection as the big guys.


AMSOIL Dominator Synthetic 15W-50 Racing Oil is suitable for following types of engines:

  • Modified, high rpm, extreme horsepower
  • Turbo-charged or super-charged
  • Gasoline or alcohol fueled
  • Nitrous oxide-injected

Dominator 15W-50 is ideal for the following type of applications:

  • Any type of racing or highly modified, high horsepower vehicle requiring a 20W-50 or 15W-50 engine oil.
  • Muscle cars and street rods*
  • Suitable for high performance street or modified import cars *

*Not suitable for street vehicles with modern factory emissions equipment in place.  Contact us with any questions on this.

Oil Change Interval For AMSOIL Dominator Synthetic 15W-50 Racing Oil

Change Dominator Synthetic 15W-50 Racing Oil at the interval as prescribed by the engine builder or engine manufacturer.

Mixing AMSOIL Dominator 15W-50 Racing Oil with Other Brands

Dominator Synthetic 15W-50 Racing Oil is compatible with all other brands of conventional and synthetic motor oils. While you can safely mix AMSOIL Synthetic Oil with other brands, this will reduce the drain interval and performance capabilities of AMSOIL Dominator 15W-50.

The use of any aftermarket oil additives with AMSOIL Dominator Synthetic 15W-50 Racing Oil is definitely NOT recommended.


AMSOIL Dominator Synthetic 15W-50 Racing Oil (RD50)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)


Kinematic Viscosity @ 40°C, cSt (ASTM D-445)


Viscosity Index (ASTM D-2270)


CCS Viscosity (°C), cP (ASTM D-5293)

6787 (-20)

Pour Point °C (°F) (ASTM D-97)

-36 (-33)

Flash Point °C (°F) (ASTM D-92)

238 (460)

Fire Point °C (°F) (ASTM D-92)

250 (482)

Four Ball Wear Test
(ASTM D-4172B: 40 kgf, 75°C, 1200 rpm, 1 hr), Scar, mm


Noack Volatility, % weight loss (g/100g) (ASTM D-5800)


Shear Stability Kurt Orbahn (ASTM D-6278),
% viscosity change 90 cycles.


High-Temperature/High-Shear Viscosity,
150ºC, 1.4x106s-1, cP (ASTM D-5481)


AMSOIL Dominator Synthetic 15W-50 Racing Oil
A pro-grade racing engine oil designed to increase horsepower and withstand extreme heat and abuse for extended periods.
Manufacturer: AMSOIL
Model: Dominator Synthetic 15W-50 Racing Motor Oil
Product ID: RD50