OS Giken OS-250R V2 is the latest evolution of the company’s renowned high-performance LSD gear oil. Used and trusted for over 18 years, the updated V2 formulation enhances extreme-pressure capability, improves lubrication, and further reduces friction to maximise the performance and longevity of OS Giken mechanical LSD units.

Developed jointly with a specialist oil manufacturer, OS-250R V2 is engineered specifically to bring out 100% of the performance potential of OS Giken’s Super Lock LSD. Its formulation allows the LSD’s internal clutch discs to operate smoothly, consistently, and with optimal lock-up behaviour under demanding conditions.

Key Features:

• Improved V2 Formula: Enhanced extreme-pressure performance, reduced friction, and superior lubrication compared with the original OS-250R.
• Purpose-Built for OS Giken LSDs: Designed to perfectly match the operating characteristics of OS Giken mechanical L.S.D units for smoother, more direct engagement.
• High Viscosity with Excellent Cold Start Ability: Despite being an ultra-high-viscosity 250-weight oil, it retains 80W cold-flow properties for rapid circulation at start-up.
• Premium Base Oils: Formulated using PAO (polyalphaolefin) and polyol ester for superior thermal and shear stability.
• Advanced Additive Package: Uses newly developed Sulphur/Phosphorus/Boron additives for strong wear protection and load-carrying capability.
• Anti-Chatter Performance: Includes friction modifier agents tuned specifically for mechanical LSDs to reduce chatter, vibration, and noise.

Technical Specifications:

• SAE Rating: 80W-250
• API Rating: GL-5
• Flash Point: 208°C
• Kinematic Viscosity: 320.5 mm²/s @ 40°C / 43.7 mm²/s @ 100°C
• Type: Full Synthetic
• Vehicle Type: FR (Rear-Wheel Drive) applications

OS Giken OS-250R V2 is essential for achieving optimal performance, stability, and longevity from any OS Giken Super Lock LSD. Ideal for both street and motorsport use, it delivers consistent locking characteristics, improved wear resistance, and exceptional thermal stability.