Post by
Socaldiablo »
https://forums.nicoclub.com/socaldiablo-u163627.html
Tue Dec 20, 2011 4:02 pm
Infiniti recommends platinum-tipped plugs and for your engine, you need PLFR5A-11 or you can use PLFR4A-11 (hot type) or PLFR6A-11 (cold type), all with a gap of 0.043 inches (1.1 mm). I believe these part nos. are all NGK brand and you can get them on Amazon.com for about $9-$10 each. I didn't see the 4A ones on there but the 5A and 6A are avail on Amazon.
Can't help you on a mechanic in your area. If you don't get response on here, I suggest looking online for one. If you have an Infiniti mechanic do this for you, they may want you to buy the plugs from them. If you do it yourself, then you can order them as I mentioned above.