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.
It is possible to change the brake fluid yourself but need article writing.