Tl*the contact owns a 2004 land rover discovery. the contact stated while driving approximately 35 mph on normal road conditions. there was a loud knocking noise coming from the engine. the oil pressure warning light indicator illuminated on the instrument panel. the warning indicator remained illuminated until the engine was turned off. the vehicle stalled while attempting to pull over to the side of the road. roadside assistance was called to the scene. the vehicle was towed to an authorized dealer for inspection. the technician stated the engine required replacement. the vehicle has not been repaired for the failure. the failure and current mileages were 46,842.