Brake fluid
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Lotus specify Castrol Super DOT 4 brake fluid, this is a fully synthetic brake fluid that exceeds the boiling point specifications of most DOT 5.1 fluids. It is no more costly than a DOT 5.1 fluid and has been used with no problems whatsoever by regular track day addicts. It is thought that using a more specialised DOT4 compatable brake fluid serves little purpose apart from costing more and requiring more frequent fluid changes.