Tamiya Silicone Oil 4000 is aimed at modellers seeking steadier diff performance. It is formulated for oil-filled gear differentials to provide a compromise between stability and on-power speed through corners.
Different grades of silicone oil change how the car transfers drive during turns. Choosing a higher viscosity such as 4000 will generally increase cornering stability at higher speeds, while lower viscosities favour slow, technical driving.
The oil is supplied in a yellow plastic bottle containing 40cc. That quantity will typically cover about 22 fills for standard touring-car differentials, suitable for regular maintenance and set-up changes.
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