Has anyone changed the spark plugs in their Murano? Difficulty in getting to plugs under intake manifold? Time involved to complete. Use of iridium plugs? Thanks in advance for any info.
On Maxima.org, we determined there are no better plugs for the VQ than the stock NGK laser platinums. You may try a different heat range depending on your climate, but I would stick with the OEM plugs - they are of excellent quality.
I've read a few of your posts indicating tests done on the Maxima.org site suggest the stock NGK double platinum plugs (not laser iridiums) are the best for the MO engine. Do you have a link?
From my understanding iridium is "better" than platinum and the copy from NGK's site (see below) backs this up too. Not sure why I wouldn't use iridium... they're even cheaper on NGK's site too!
"Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200(=F) higher melting point than platinum and conducts electricity better. This makes it possible to create the finest wire center electrode ever. Prior till now, platinum had been favored for long life or performance spark plugs due to its high melting point, also the technology did not exist to machine and bond iridium on a spark plug electrode(at least in a cost effective manner). Iridium industrial spark plugs have been around for years, but still sells for over a hundred dollars per plug. Just now is the technology available to effectively use iridium in a spark plug for automotive applications. The strength, hardness and high melting point of iridium allows NGK to manufacture their iridium ultra-fine wire center electrode to 0.7mm. One of the finest firing points in the industry!"
