Redline 40WT Race Oil Quart

Redline 40WT Race Oil (Quart)

Redline 40WT Race Oil is a fully synthetic 15W40 racing motor oil. Racers choose it for stock car racing, road racing, and sprint car applications. Redline reformulated it for improved frictional properties, so it also delivers more power. Compared to a conventional oil of similar viscosity, that gain is typically 2 to 4%.

This oil is popular with many top Dirt Late Model teams. NASCAR spec engines in the Camping World East and West Series also use it. Special detergents improve lubricity and reduce detonation, while polyol ester base stocks add stability and film strength under fuel dilution. Redline’s race oil lineup spans from a 5WT oil all the way up to a 70WT oil for nitro applications. A 40WT designation is Red Line’s way of labeling a 15W40 oil for racers who think in single-weight terms.

How Redline 40WT Race Oil Protects

Redline 40WT Race Oil contains no less than 2200 ppm of zinc and phosphorus for antiwear protection. As a result, it protects hard-working race engines at startup, when wear risk is highest. It also runs cooler and stays cleaner than conventional race oils. Its NOACK evaporation loss of just 6% at 250°C also means less oil burns off during a race. Because race conditions are so demanding, change this oil more often than a standard motor oil.

Typical Properties

• SAE Viscosity Grade: 15W40
• Viscosity @ 40°C: 93 cSt
• Viscosity @ 100°C: 14.5 cSt
• Viscosity Index: 162
• Pour Point: -45°C (-49°F)
• Zinc: 2440 ppm avg
• Phosphorus: 2200 ppm avg

This Quart size is handy for smaller top-ups or a single oil change on a small-block engine. It’s also available in a Gallon size for teams running a full race season. Always check your engine builder’s recommendation before choosing a race oil viscosity. Not sure whether 40WT is the right grade for your engine? Get in touch and we’ll help you choose. For the full technical data sheet, see Redline’s official product page.