OS Giken OS250R V2 Gear Oil

OS250R V2 Full Synthetic Gear Oil

OS250R  full synthetic Gear Oil was developed specifically for the OS Giken Super Lock differentials. The 90-05 Miata uses 1 can.

• 80W-250
• 1 liter can

The legendary OS-250R V2 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 compatible and can be mixed with any remaining original OS250-R.

• Pull-tab type cap to ensure better seal and product shelf-life.

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.

Service intervals

We recommend a break in period of either one competition weekend on 1,000 miles /1600km street driving for new OS Giken differentials. Replace fluid then use 50hrs race or 25,000 miles street as regular gear oil change intervals. If your OS Giken begins making harsh noises when turning but is quiet when driving straight, your gear oil needs to be replaced.