Mercury – ACDelco Double Platinum Spark Plug | Ignition System | Nickel Alloy & Copper Core | 8M0129146Mercury ACDelco Double Platinum Spark Plug Ignition System Nickel Alloy & Copper Core 8M0129146 Overview Theres a particular kind of comfort that comes from an engine that fires immediatelyno hesitation, no uneven rumble, just a clean, confident start that tells you the days going to go right. That feeling isnt accidental. It comes from parts like the Mercury 8M0129146 ACDelco GM Original Equipment Double Platinum Spark Plug doing their job exactly as