Why Idemitsu Racing 5W-40 Fully Synthetic Engine Oil Is the Ultimate Choice for Japanese Racing Engines

In the world of Japanese performance engineering, precision is everything—from the pistons and bearings to the oil that keeps it all moving. When pushing your engine to its limit on the track, reliability, performance, and protection are non-negotiable. That’s where Idemitsu Racing 5W-40 Fully Synthetic Engine Oil steps in as the ultimate lubrication solution for Japanese racing engines.

Engineered for Maximum Performance

At the heart of Idemitsu Racing 5W-40 is a cutting-edge fully synthetic base oil formulation, engineered to deliver exceptional horsepower and torque while maintaining unparalleled wear protection. The oil’s formulation incorporates High-Performance Additive (HPA) technology, specially tuned for racing environments where thermal stress, high RPMs, and intense loads are standard.

Precision Molybdenum Additives for Racing Power

One of the standout features of this oil is its precisely controlled molybdenum agents, which are key to reducing friction between metal surfaces. Less friction means more power gets to the wheels—exactly what you need on the track. These additives also contribute to enhanced sealing of the combustion chamber, which directly improves compression and power output.

Optimized for Japanese Racing Engines—Especially Wankel Rotaries

Idemitsu Racing 5W-40 isn’t just another high-performance oil; it’s specifically designed with Japanese racing engines in mind, including notoriously demanding Wankel rotary engines. These engines require oil with exceptional shear stability and wear protection, especially for critical components like the eccentric shaft and main bearings. Idemitsu delivers both.

Built for Turbocharged and Supercharged Applications

Japanese sports cars like the Nissan GT-R, Subaru WRX STI, and Mazda RX-7 are often equipped with turbocharged or supercharged engines. These forced induction systems place additional thermal stress on engine oil, particularly in turbo bearings. Idemitsu Racing 5W-40 combats this with:

• Superior high-temperature stability
• Reduced bearing coking
• Lower exhaust port clogging
• NOACK volatility of just 8.5%, reducing oil burn-off and deposits

Race-Ready Viscosity and Performance Metrics

Backed by rigorous ASTM testing, Idemitsu Racing 5W-40 offers:

• HTHS viscosity of 4.0 mPa-s @150°C: Ensures a strong, protective oil film under extreme temperatures.
• Viscosity index of 167: Indicates excellent stability over a broad temperature range.
• Cold-start CCS viscosity of 4600 cP @ -30°C: Ensures reliable performance in cold conditions, minimizing wear at startup.

Turbo Longevity and Engine Cleanliness

Racing isn’t just about making power—it’s about making it reliably. That’s why Idemitsu’s formulation includes anti-coking agents that extend turbocharger life and minimize carbon buildup in exhaust ports, allowing for longer runs between maintenance and consistent engine output.

ISO-Certified and Backed by Idemitsu's Racing Heritage

As an ISO-certified lubricant manufacturer with decades of experience supporting motorsports, Idemitsu brings a legacy of Japanese engineering excellence to its oil products. This commitment is evident in every drop of Idemitsu Racing 5W-40.

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Final Verdict: The Track-Ready Choice for Japanese Engines

Whether you’re piloting a high-revving Honda VTEC, a turbocharged Toyota 2JZ, or a high-strung rotary engine, Idemitsu Racing 5W-40 Fully Synthetic Engine Oil delivers the power, reliability, and protection your engine demands. Backed by top-tier testing and real-world racing results, it’s not just an oil—it’s a performance upgrade.

Ready to elevate your engine’s performance? Choose Idemitsu. Race proven. Engine trusted. Available online at mcrimi-motorsports.com