Mercury - Quicksilver NGK BPR5EFS-13 Spark Plug Ignition 33-8M0095454. Overview. On the MerCruiser 4.5L and 6.2L engines, the spark plugs carry a lot of the load. When they start getting worn, the engine usually tells you-idle gets a little rough, throttle feels mushy, or the motor just doesn't have the same bite when you push it. These NGK BPR5EFS-13 plugs are the exact plugs Mercury calls for on these engines. They hold up well to heat, vibration, and long days on the water, and they keep the