Old cars as well as nautical engines, agricultural equipment, vehicles used for public works, motorcycles without catalysts are not originally equipped with reinforced valves or valve seats. Without the protection of lead, which has a lubricating effect, the operation of the valves involves significant wear causing a recession of the valve seat, which reduces performance and damages the engine. That is why we must compensate for the absence of lead with our additive. PROPERTIES: BARDAHL LEAD SUBSTITUTE lubricates the valves and forms a protective film that reduces wear on the seats and keeps the valves in their ideal position when closed. It allows to increase performance while also avoiding early engine wear. Burns completely without leaving residue. Prevents mechanical parts from breaking. With BARDAHL LEAD SUBSTITUTE, gasoline is preserved for another 24 months. Avoid compression losses.