Premium OEM-grade spark plug kit for Volvo (2011-2016 S60/S80/XC60/XC90) with exact OE numbers 31286359 & 31673604. Precision-engineered nickel alloy electrodes ensure optimal thermal conductivity and 30% longer lifespan than standard plugs. Laser-welded iridium tips deliver consistent spark energy for improved combustion efficiency. Factory-matched heat range prevents pre-ignition in turbocharged engines. Complete ignition system solution with corrosion-resistant copper core and triple gasket seal. Direct replacement for worn plugs causing misfires or cold-start issues. Bulk packaged for commercial workshops and fleet maintenance. Ships globally with wholesale pricing for 50+ units.