The invention relates to a fluid distributor for a heavy-construction machine, comprising a body and a pressure-reducing means which is mounted in said body and comprises a pushrod arranged in a cavity of the body, a plunger being mounted in an oscillating manner. A resistor having a first node and a second node is coupled to a bi-directional IO pin at the first node. The novel lubricant compositions are highly resistant to oxidative degradation and are capable of reducing the negative effects of deposits, such as black sludge, in motor combustion engines, particularly spark ignition internal combustion engines. The spindle is attached to the inner shaft and defines slot.