Castrol EDGE 5W-40 gives you the confidence to demand maximum engine performance from today’s higher revving, higher output engines that operate under increased pressures requiring lower viscosity oils with higher level of protection. Castrol EDGE is up to 40 percent stronger at reducing metal to metal contact when under the engine’s severest pressures. Independent tests also proved that Castrol EDGE is stronger for up to 35 percent longer. All our oils give you the confidence to demand enhanced performance from your engine. So the next time your car needs oil, ask for Castrol EDGE.