2011 Infiniti M Owner's Manual - Page 434
2011 Infiniti M Manual
Page 434 highlights
SPARK PLUGS AIR CLEANER WARNING Be sure the engine and the ignition switch are off and that the parking brake is engaged securely. CAUTION Be sure to use the correct socket to remove the spark plugs. An incorrect socket can damage the spark plugs. SDI2020 REPLACING SPARK PLUGS If replacement is required, see an INFINITI retailer for servicing. SDI2549 Iridium-tipped spark plugs It is not necessary to replace the iridium-tipped spark plugs as frequently as the conventional type spark plugs since they will last much longer. Follow the maintenance schedule in "INFINITI Service and Maintenance Guide", but do not reuse them by cleaning or regapping. Always replace spark plugs with recommended or equivalent ones. VK56VD engine Maintenance and do-it-yourself 8-19