Idemitsu Racing Rotary Engine Oil 10W-30 (Full Synthetic) - Excellent choice for Naturally Aspirated Rotary Engines - Formulated Specifically For High Performance Rotary Engines - Contains Special Molybdenum Agents to Reduce Friction, Which Increases Horsepower & Torque - Improved Sealing Performance - Minimizes Exhaust Port Clogging -Superior Shear Stability - Exceptional Wear Protection & Durability