2013 Nissan Altima Owner's Manual - Page 355

SPARK PLUGS ● VQ35DE: Always replace spark plugs with recommended or equivalent ones AIR CLEANER WARNING Be sure the engine and 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. SDI1895 REPLACING SPARK PLUGS Iridium-tipped spark plugs A It is not necessary to replace iridium-tipped ᭺ spark plugs as frequently as conventional type spark plugs because they last much longer. Follow the maintenance log shown in the "NISSAN Service and Maintenance Guide". Do not service iridium-tipped spark plugs by cleaning or regapping. If replacement is required, see your NISSAN dealer for assistance. NOTE: LDI2117 QR25DE The air cleaner filter should not be cleaned and reused. Replace the air cleaner filter according to the maintenance log shown in the "Warranty Information and Maintenance Booklet." To remove the air cleaner filter: ● Unlatch the clips and move the air cleaner cover upward. ● Remove the air cleaner filter. ● QR25DE: Always replace spark plugs with recommended ones. 8-20 Maintenance and do-it-yourself