VROOAM CASTOR BLEND RACING T2 STROKE OIL 1 LITRE High performance 2-stroke kart racing engine oil based on castor and synthetic components including VROOAM’s additive performance technology. Specifically produced for high-performance, high-RPM 2-stroke racing engines. Perfect for Formula A reed and rotary valve engines. Ideal replacement for Shell Advance M For all racing premix 2-stroke racing engines with a mixing ratio as specified by the engine manufacturer or engine tuner. Shake Castor Blend bottle well before mixing oil with the fuel.