I went to change my spark plugs today and the old plugs were PFR5C-11, while the new ones that I ordered from courtesy were PFR5G-11. What is the difference between them and can I still use them? Thanks

 

Search is your friend:

http://forums.maxima.org/showthread....hlight=PFR5C11


Basically, Courtesy sold you plugs for the VQ motor on 4th gens, instead of the VE motor on 3rd gens.


Here is tech info from NGK on how to read spark plug numbers:

http://www.ngksparkplugs.com/techinf...tnumberkey.pdf

Basically, the difference in the plugs is the VE uses a low angle ground electrode while the VQ uses a Fine Wire Nickel Alloy Center Electrode.


Point is, Courtesy screwed up.