WHAT IS AN OEM PLUG
Original Equipment Spark Plugs
When you change your spark plugs, should you use the same brand and part number as the original, or a different brand?
Most professional technicians say they usually replace same with same, unless there is a reason to install a different brand of spark plug. If you use the same spark plug that the engine came equipped with from the factory, you should not have any problems with spark plug Fouling, misfiring , detonation or pre-ignition
When a vehicle manufacturer chooses a certain spark plug for an engine, the plug has to undergo extensive validation testing to make sure it does not run too cold and foul, or run too hot and cause detonation or Pre-ignition, or suffer misfiring due to electrode position or wear. Most original equipment spark plugs today are platinum or iridium and have a recommended replacement interval of 100,000 miles. So the validation testing is designed to simulate that kind of mileage before the plug receives its stamp or approval.
SPARK PLUG BRANDS