Datsun Z-Series (240Z, 260Z, 280Z) Spark Plug Replacement Guide

240Zs, 260Zs, and 280Zs all use the NGK BP6ES spark plug.

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 vintage car like the Z, 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 240Z, 260Z, or a 280Z, your best bet is to purchase an NGK BP6ES spark plug. Of course, you can find other (equivalent) plugs, but the BP6ES is the tried-and-true option for this car. If you wish to purchase online, you can buy these directly from NGK through Amazon. Although these come pre-gapped at 0.031in (0.8mm), 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.

If you would prefer to watch a video of this guide, it is embedded below or you can watch directly on YouTube by clicking this link.

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 (Range)
240Z 0.8mm-0.9mm, 0.031-0.035in
260Z 0.8mm-0.9mm, 0.031-0.035in
280Z 1.0mm-1.1mm, 0.039-0.043in

 

Note that you may come across a few NGK plugs that have similar model numbers, such as the BPR6ES or the BP6ES-11. These are ultimately the same plug, but have slight differences. The BPR6ES merely means that it is a resistance plug which is used suppressing electrical interference caused by sparking. This can be helpful in cars that have on-board computer systems so in a vintage car like the 240Z, a resistor plug isn’t really necessary. In fact, resistor plugs actually cause a decrease in spark power, but it is so slight that it wouldn’t really make a noticeable difference. If you can only find NGK BPR6ES plugs they will work just fine. The BP6ES-11 is the same plug, just pre-gapped to 0.044in (1.1mm), but since you will be checking (and modifying) the plug gap, you can purchase those and they will work.

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 applying some grease to the threads should be enough though. Torque the plugs to 11-15 ft. lbs.

Mobile Sliding Menu