Nissan 300ZX (Z31, Z32) Spark Plug Replacement Guide

Any NGK spark plug you’ll need for your 300ZX can be found on our site, such as the NGK BCPR6E-11 recommended for a Z31 Turbo.

There will inevitably come a time in your Z-Car ownership when you will need to replace your spark plugs. Some decide to replace their plugs fairly often, every 10,000 miles or so. This is fairly normal for a 30+ year old car like the 300ZX, but you can likely get away with waiting a bit longer than that if you wish.  Obviously, if you experience signs of spark plug failure, it is likely time to replace your plugs regardless. On a Z31 or Z32 300ZX, you should always purchase NGK spark plugs, but the actual plug type depends on a few factors:


Z32 Spark Plugs

Non-Turbo: NGK PFR6G-11

Turbo: NGK IFR6E-11 (6741)


Z31 Spark Plugs

Non-Turbo: NGK BCPR6ES-11

Turbo: NGK BCPR6E-11


If you wish to purchase online, you can buy these directly through ZCarGuide. Although all of these spark plugs come pre-gapped, you will want to make sure you double check the gaps with a spark plug gap gauge that can accommodate the gap range we are looking for, such as this one.

Some of the links on ZCarGuide page may be affiliate links, meaning I receive a commission (at no extra cost to you) if you click on the link and make a purchase. I only recommend products I’ve used and trust unless stated otherwise. 

Model Spark Plug Gap 
Z32 Non-Turbo 0.44in
Z32 Turbo 0.035in
Z31 Turbo 1.0mm-1.1mm, 0.039-0.043in
Z31 Non-Turbo 1.0mm-1.1mm, 0.039-0.043in



To remove, you will want to use a 21mm or 13/16in deep/sparkplug socket, such as this one. You may find that some plugs do not look all that worn or in need of replacement, but in general it is always a good idea to replace all 6 at once with brand new plugs. If you choose to use anti-seize, be careful not to apply too much. Lightly oiling the threads should be enough though.

For more information about removing your old plugs and reinstalling new ones, we recommend the YouTube video embedded below:

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