Royal Purple XPR Synthetic Racing Oil - 10W40 | 1 Quart (06041)

Protect your race engine at the highest level with Royal Purple XPR (Extreme Performance Racing) synthetic motor oil. The 10W40 viscosity in a convenient 1-quart bottle, the Royal Purple 06041 is a full synthetic racing oil formulated with Royal Purple's proprietary Synerlec additive technology — trusted in NASCAR, NHRA, World of Outlaws, and Bonneville Salt Flats competition where engine protection and performance are non-negotiable.

Note: Racing oil formulated for competition use. Verify compatibility with your specific engine and application before use. Not all racing oils are suitable for street use or emissions-compliant vehicles.

Key Features:

• Full synthetic extreme performance racing oil
• 10W40 viscosity
• Royal Purple proprietary Synerlec additive technology
• Proven in NASCAR, NHRA, World of Outlaws, and Bonneville Salt Flats
• 1 quart (946ml)
• Royal Purple XPR racing heritage

Performance Benefits:

• Synerlec Technology: Royal Purple's proprietary additive system provides superior film strength and lubrication compared to conventional racing oils
• Extreme Temperature Protection: Formulated for the sustained high temperatures of racing applications where conventional oils break down
• Reduced Friction: Synerlec additive technology reduces metal-to-metal contact for improved power output and reduced wear
• Film Strength: Maintains oil film integrity under the extreme pressures of high-RPM racing engines
• Motorsport Proven: Trusted by professional race teams in NASCAR, NHRA, World of Outlaws, and Bonneville applications
• Full Synthetic Base: Superior thermal stability and oxidation resistance compared to conventional or semi-synthetic racing oils

Specifications:

• Brand: Royal Purple
• Part Number: 06041
• Product: XPR Synthetic Extreme Performance Racing Oil
• Viscosity: 10W40
• Volume: 1 quart (946ml)
• Base: Full synthetic
• Additive Technology: Synerlec
• Weight: 12.3 lbs (case weight — verify single quart weight)
• Barcode: 10641330010412

Applications:

• High-performance and racing gasoline engines requiring 10W40 viscosity
• NASCAR, NHRA, drag racing, circle track, and road racing applications
• World of Outlaws sprint car and dirt track applications
• Bonneville Salt Flats and land speed racing
• High-RPM naturally aspirated and forced induction racing engines
• Note: Verify viscosity and additive compatibility with your specific engine builder's recommendations before use
• Note: Not recommended for engines with catalytic converters or emissions systems without verifying compatibility
• Note: Check oil change intervals with your engine builder — racing oils may require more frequent changes than street oils

Royal Purple Synerlec Technology — The Core Advantage:

The defining feature of Royal Purple XPR is the proprietary Synerlec additive technology. Synerlec is Royal Purple's advanced additive system that works at the molecular level to create a stronger, more durable oil film between moving metal surfaces. Conventional lubricant additives work primarily through chemical reactions with metal surfaces — a process that consumes the additive over time and can leave metal surfaces temporarily unprotected during the reaction. Synerlec's approach creates a more robust and persistent lubricating film that maintains its protective properties under the extreme pressures and temperatures of racing applications, where conventional additive systems may break down or be depleted more rapidly.

The practical result of Synerlec technology is reduced friction between engine components, which translates to lower operating temperatures, reduced wear, and — in a racing context — measurable improvements in power output as energy that would otherwise be lost to friction is converted to useful work at the crankshaft. Royal Purple's motorsport customers have reported measurable power gains after switching to XPR, a result of the reduced parasitic friction losses that Synerlec technology provides.

10W40 Viscosity — Racing Application:

The 10W40 viscosity grade is a common choice for high-performance and racing gasoline engines, particularly in warmer ambient temperatures and for engines with tighter bearing clearances that benefit from a slightly thicker oil film. The "10W" cold rating indicates the oil flows adequately at cold temperatures for startup protection, while the "40" hot rating indicates the oil maintains adequate viscosity at operating temperature to protect bearings and other critical components under load. In a racing context, the 10W40 grade is appropriate for many naturally aspirated and forced induction gasoline engines operating in warm to hot ambient conditions — always verify the correct viscosity with your engine builder for your specific application.

Motorsport Credentials — NASCAR, NHRA, World of Outlaws, Bonneville:

Royal Purple XPR's motorsport credentials span some of the most demanding racing environments in North America. NASCAR Cup Series engines operate at sustained high RPM for hours at a time, generating extreme heat and placing enormous demands on the lubricating oil. NHRA Top Fuel and Funny Car engines — while using nitromethane fuel and specialized lubricants — represent the extreme end of motorsport lubrication demands, and Royal Purple's involvement in this series reflects their commitment to extreme performance applications. World of Outlaws sprint cars operate on dirt tracks with high-RPM, high-compression engines that demand consistent lubrication under variable conditions. Bonneville Salt Flats land speed racing subjects engines to sustained maximum-effort operation for extended periods — one of the most demanding tests of engine oil performance available. Royal Purple XPR's proven performance across all of these disciplines reflects the genuine extreme performance capability of the XPR formula.

Full Synthetic Base — Why It Matters for Racing:

Royal Purple XPR uses a full synthetic base oil rather than conventional mineral oil or a semi-synthetic blend. Full synthetic base oils provide several critical advantages for racing applications. Synthetic base oils have a more uniform molecular structure than mineral oils, providing more consistent viscosity across a wider temperature range — important in a racing engine where oil temperature can vary significantly between startup, warm-up, and sustained high-load operation. Synthetic oils also have superior oxidation resistance, meaning they resist breaking down chemically at high temperatures better than mineral oils — critical in a racing engine where oil temperatures can exceed the limits of conventional oils. The superior thermal stability of synthetic base oils also means the oil maintains its viscosity and protective properties for longer under sustained high-temperature operation.

Racing Oil Change Intervals:

Racing oils like Royal Purple XPR are formulated for performance rather than extended drain intervals. In a racing application, oil change intervals are typically determined by the engine builder based on the specific application, power level, and operating conditions — not by a fixed mileage or time interval. Many racing teams change oil after every race event or after a specified number of engine hours, regardless of the oil's apparent condition. Always follow your engine builder's recommendations for oil change intervals when using XPR in a racing application. For track day or performance street use, consult Royal Purple's recommendations for the appropriate change interval for your specific use case.

Why Royal Purple?

Royal Purple is one of the most respected names in high-performance synthetic lubricants, with decades of motorsport involvement and a reputation for genuine performance improvements backed by real-world racing results. Their XPR line represents the pinnacle of their lubricant technology — formulated without compromise for racing applications where engine protection and performance are the only priorities. For race engine builders and performance enthusiasts who demand the best available lubrication for their engines, Royal Purple XPR is a benchmark choice trusted by professional teams at the highest levels of motorsport.

Perfect For:

• Race engines requiring 10W40 viscosity synthetic racing oil with maximum film strength
• NASCAR, NHRA, circle track, and road racing applications requiring proven extreme performance lubrication
• World of Outlaws and dirt track sprint car engines
• Bonneville and land speed racing applications
• High-performance street and track engines where the engine builder specifies a premium synthetic racing oil

Perfect For: Racing and high-performance engines requiring Royal Purple XPR 10W40 synthetic extreme performance racing oil with Synerlec additive technology for maximum film strength, reduced friction, and proven motorsport performance.

Pro Tip: Always consult your engine builder for the correct viscosity and oil change interval for your specific application — the correct viscosity for your engine's bearing clearances and operating conditions is as important as the oil quality itself, and using the wrong viscosity can reduce protection even with a premium oil like XPR.

10W40 | 1 Quart | Full Synthetic: Synerlec additive technology. NASCAR, NHRA, World of Outlaws, Bonneville proven. Racing application — verify compatibility with your engine builder. Not for emissions-compliant street use without verification.

Protect your race engine with Royal Purple XPR 10W40 — full synthetic, Synerlec technology, extreme performance racing oil proven in NASCAR, NHRA, World of Outlaws, and Bonneville competition.