2013 Nissan GT-R Owner's Manual - Page 287

AIR CLEANER replacing the filter, wipe the inside of the air cleaner housing and the cover with a damp cloth. WARNING . Operating the engine with the air cleaner removed can cause you or others to be burned. The air cleaner not only cleans the air, it stops flame if the engine backfires. If it isn't there, and the engine backfires, you could be burned. Do not drive with the air cleaner removed, and be careful when working on the engine with the air cleaner removed. Never pour fuel into the throttle body or attempt to start the engine with the air cleaner removed. Doing so could result in serious injury. REPLACING SPARK PLUGS If replacement is required, see a GT-R certified NISSAN dealer for servicing. . 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 NISSAN Service and Maintenance Guide, but do not reuse them by cleaning or regapping. Always replace spark plugs with recommended or equivalent ones. 1 as illustrated and pull Remove the retainers * 2 . out the filter element * The filter element should not be cleaned and reused. Replace it according to the maintenance intervals. See NISSAN Service and Maintenance Guide for maintenance intervals. When 8-20 Maintenance and do-it-yourself