Millers Worm Steering Box Oil is a special mineral oil for steering boxes*. It is far superior to standard gear oil as it contains friction modifiers, which reduce the friction between the gear and the pinion resulting in a better steering feel. Millers Worm Steering Box Oil is used and recommended by the Rolls Royce Enthusiasts Club.
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* The worm and sector steering box was one of the first steering box designs. It comprises a steering wheel shaft with a “worm” screw on the end, and a section gear that is moved up and down as the steering wheel turns.