OILS, GREASES AND LUBRICANTS FOR INTERNAL-COMBUSTION ENGINES OF TRACTORS, EARTHWORK MACHINES AND FARM MACHINES; OILS, GREASES AND LUBRICANTS FOR TRANSMISSION ELEMENTS OF EARTHWORK MACHINES, TRACTORS AND FARM MACHINES; OILS FOR HYDRAULIC BRAKING SYSTEMS OF THE AFORESAID VEHICLES; OILS FOR HYDRAULIC SERVO CONTROL SYSTEMS OF EARTHWORK MACHINES, TRACTORS AND FARM MACHINES