The present invention provides a fischer-tropsch derived diesel which has an initial boiling point of at least 165 ° C and a final boiling point of a maximum of 360 ° C. In another aspect, the present invention provides a functional fluid formulation comprising a fischer-tropsch-derived diesel which has an initial boiling point of at least 165 ° C and a final boiling point of a maximum of 360 ° C.
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