Same Performance. Enhanced Flow. Iconic Blue.

The legendary OS-250R has evolved. We’ve leveraged decades of championship-winning racing heritage to introduce OS-250R V2—the official successor to our original gold gear oil. Re-engineered for superior flow characteristics, OS-250R V2 delivers faster penetration into the clutch pack and more consistent lubrication, even under the most extreme thermal loads.

What’s New?

• OS-250R V2 now supersedes the original OS250-R formula. As we transition our inventory, OS-250R V2 becomes the new global standard for all OS Giken mechanical LSDs.

• Signature Blue Tint: Now featuring a distinct blue color to differentiate it from the original gold formula.

• OS-250R V2 is 100% compatible and can be mixed with any remaining original OS250-R. Upgrade with total confidence.

Precision Engineering

Despite its ultra-high 250-grade viscosity, the fluid maintains an 80W low-temperature rating. This ensures immediate protection for your friction discs from the very first turn. Built on a premium PAO and Polyol Ester base, our proprietary S/P/B (Sulfur-Phosphorus-Boron) additive package surpasses API GL-5 standards, creating a reinforced oil film that laughs at extreme pressure.

The OS Giken Advantage

OS-250R V2 is optimized specifically to refine LSD lock-up timing, delivering the progressive and predictable engagement that defines the OS Giken experience. Advanced friction modifiers eliminate chatter and vibration, allowing you to bridge the gap between driver and machine.