AMSOIL DOMINATOR 15W-50 Synthetic Racing Oil
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Straight-Grade Protection in a Multi-Grade Formulation
AMSOIL DOMINATOR 15W-50 Synthetic Racing Oil is designed for the most demanding racing applications that require heavy film strength. It is engineered to withstand the elevated RPM, high temperatures and shock-loading common to endurance, rally, truck-pull and diesel racing.
Key Benefits
- Heavy film strength with 5.4 cP HTHS viscosity
- Highest fire point (272°C) among multi-grade DOMINATOR oils
- Broadest competition coverage — endurance, rally, truck-pull, diesel racing
- Proprietary friction modifiers maximize horsepower and torque
- Heavily fortified with zinc and phosphorus anti-wear additives
- Resists viscosity loss due to mechanical shear
- Tested and validated by championship-winning race teams
- Available to all racers — same formula used by AMSOIL-sponsored professionals
Heavy Film Strength for Demanding Applications
DOMINATOR 15W-50 delivers strong film protection with an HTHS viscosity of 5.4 cP. Its durable formulation resists viscosity loss due to mechanical shear. It is heavily fortified with zinc and phosphorus anti-wear additives for additional protection against scuffing and wear.
Its high fire point of 272°C (522°F) — the second highest in the lineup — provides exceptional thermal stability for extended racing events.
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 17.9 |
| Kinematic Viscosity @ 40°C, cSt | 121.0 |
| Viscosity Index | 164 |
| CCS Viscosity, cP (°C) | 6062 (-20) |
| Pour Point | -38°C (-36°F) |
| Flash Point | 238°C (460°F) |
| Fire Point | 272°C (522°F) |
| Four-Ball Wear Test Scar, mm | 0.39 |
| Total Base Number | 8.0 |
| High-Temperature/High-Shear Viscosity @ 150°C, cP | 5.4 |
Applications
Compatible with leaded and unleaded gasoline, diesel, alcohol, nitromethane and nitrous oxide. Use in domestic and import high-performance racing engines where an SAE 50 viscosity oil is recommended, including: asphalt late model, dirt late model, modified big block, endurance, rally, sprint, truck-pull, aluminum block, marine, diesel racing.
Not intended for long-term use in passenger cars/light trucks.
Pros and Cons
Pros
- Heavy film strength with 5.4 cP HTHS viscosity
- Highest fire point (272°C) among multi-grade DOMINATOR oils
- Broadest competition coverage — endurance, rally, truck-pull, diesel racing
- Proprietary friction modifiers maximize horsepower and torque
- Heavily fortified with zinc and phosphorus anti-wear additives
- Resists viscosity loss due to mechanical shear
- Tested and validated by championship-winning race teams
- Available to all racers — same formula used by AMSOIL-sponsored professionals
Cons
- Premium Investment: Higher initial cost compared to conventional or "shelf-brand" synthetic oils.
- Limited Local Retail: Primarily available through authorized dealers and specialized synthetic outlets. National Synthetics is a local stocking dealer. Call 1-678-944-8816 to confirm in-stock items for same-day local pickup.
Order Through Your Independent AMSOIL Dealer
Get championship-proven protection for your race engine. As your Independent AMSOIL Dealer, we provide expert guidance and competitive pricing on all AMSOIL products.
Independent AMSOIL Dealer #1858536
Shipping & Returns
Fast, Reliable Shipping
- Free standard ground shipping on orders of $100 ($130 in Canada) or more.
- Orders under the threshold ship for a flat $9.99 ($12.99 in Canada) freight charge.
- In-stock items typically delivered in two to three business days.
- U.S. and Canada only — no shipments to PO Boxes.
30-Day Return Policy
- Return unopened, currently marketed products within 30 days for a full refund (minus freight).
- Exchange unopened products within 90 days with no restocking fee.
- Special-order items are non-returnable.
- Returns are handled directly by AMSOIL.
Frequently Asked Questions
DOMINATOR 15W-50 covers the broadest range of competition applications including asphalt late model, dirt late model, modified big block, endurance, rally, sprint, truck-pull, aluminum block, marine and diesel racing.
Customer Reviews
See all 88 reviewsAMSOIL DOMINATOR® 15W-50 100% Synthetic Racing Oil
Quality is excellent. Bought it for adding during hot weather. Recommend this oil to any one.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.