Which NGK spark plug for the LR4?

Once you get the knack for it it is not too bad to swap (2 hours?) although it is always good advice to take your time and not panic.Access to many different tools helps (extensions etc). These are 160k km plugs (100k miles)



One was rusty for some reason.

Very interesting, one or two of mine had rust on the threads just like yours.

I've used both NGK 94940 laser iridiums and Denso 3444 long life iridiums. I prefer the Denso over NGK. Better spark and longer life. I use Denso on my tuner cars too and I highly recommend them.

Well it looks like these could have made 200k kms so I don't know how much life you need lol. How did you measure spark differences between the NGK and the denso?

Is there a good guide for this procedure?

One of the posters here made a video on youtube. It comes up in a search there.

Here is the video I made on replacing your spark plugs.

I listed the parts in the description. I ordered the OEM spark plugs from amazon, but get yours from where ever they are cheapest.


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Everyone has their own tricks. I removed the air filter boxes for more room but did not completely dismantle the battery box. On the drivers side I was able to pull each individual coil one at a time without disconnecting them from the wiring loom. On the passenger side the loom is tighter so I had to unclip each coil before removing. The clips are fragile so take your time. Once the clips were removed it is much easier to remove each coil. The loom needed to be moved in order to reach the hex bolt that secures each coil. I found the toughest plug was the passenger side against the the firewall. The drivers side firewall was next. The others were much easier by comparison. It took me about 2 hours but with time I could probably chop that in half. It could take the first timer 4 hours and there is no shame in that.

make sure your plugs are gapped before going in!