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CHAMPION 318 Specifications
Insulator Height0.12 In.
Thread Diameter0.551 In.
Hex Size0.625 In.
Reach0.75 in.
Ground Electrode Quantity1
Manufacturer Heat Range12
Thread Diameter14.000 mm
Hex Size15.880 MM
ClassificationChampion Copper Plus
Center Electrode Tip MaterialNickel Copper Alloy
Ground Electrode Core MaterialNickel Copper Alloy
Electrical Terminal TypeNon-Removable Nut
Plug TypeRC12MC4
Resistor TypeYes
Copper Plus
Champion Copper Plus spark plugs have been original equipment on a wide variety of engines for many years. These plugs have nickel alloy centers and ground electrodes, with reasonably good wear characteristics. In addition, the extrusion of copper into the center electrode allows for increased conductivity and heat control.

Features & Benefits:
  • Dependable and durable
  • Built to ISO and SAE standards for proven performance
  • Patented SAC-9 semi-conductor resistor for maximum EMI & RFI suppression
  • Copper core center electrode allows for accurate control of heat range for longer life
  • TinTac® and ULTRASEAL shell for best corrosion protection of any spark plug in the industry

Which Spark Plug Is Right For You?

Material Cost Performance Lifespan Highlights
$$$ · Ultimate Ignitability & Durability
· Fast Throttle Response & Best Cold Starts
$$ · Improved Starts & Acceleration
· More Power & Better Fuel Economy
Double Platinum
$$ · Improved Efficiency
· Good For Waste Spark Systems
$ · Reduced Carbon Build-Up
· Good for Coil-On-Plug Systems
$ · Good Conductor
· Least Durable

Corona vs. Flashover
Alternate/OEM Part Number(s): 9091901176, 980795614G, 980795614P, 980795615G, MD372553, RC12MC4

CHAMPION Warranty Information:
Iridium plugs 7 years - Double Platinum Power 5 years - Platinum Power 3 years - Copper Plus 2 years