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Castrol RR363 is specially designed for use in powered hydraulic systems requiring a glycol ether type fluid, such as those used in Rolls Royce vehicles manufactured prior to 1980, having a chassis number of less than 50000. It is the only fluid approved by Rolls Royce for use in this application. Although Castrol RR363 is miscible with conventional synthetic brake fluid, this fluid should not be used for topping up, as this practice may lead to serious reduction in fluid performance. This fluid is also suitable for use in place of LHS2 in pre 1966 Citroen models fitted with a black reservoir. Castrol RR363 is formulated to be compatible with neoprene hoses used in certain Rolls Royce braking systems as well as other elastomers used in conventional automotive braking systems.