OPERATION N° D.02: Work on the Hydraulic system. Op. D. 02 1 CARS WITH SYNTHETIC HYDRAULIC FLUID. L.H.$.2 The D vehicles produced up to September 1966 use a red fluid of synthetic base in their hydraulic circuits (Fluid L.H.S.2) The main reservoir, steering unit, HP pump ( 7 pistons ), suspension spheres and accumulators are painted black.