Miles on spark plugs

My 06 4.7 has 166 k on the original plugs. It runs like new and gets 14 mpg in town. What's the most miles others have gotten on a set of original plugs. I am thinking about changing them out, but I have been waiting for signs of wear ie: low mileage or performance.

 

Have you pulled one out to see how it looks?

 

No, plan to. Have to pick up a socket appropriate to reach in the recess. Any suggestions for a reasonably priced one?

 

Replace them w/ OEM Denso Iridiums.
Don't buy them off Amazon or ebay . . . there's fakes out there.
Buy from a reputable store.
Check your coil packs for cracks while you're in there.
Don't use anti-seize on the plug threads.
Torque them appropriately.

 

I’m not fully sure I support the replace cracked coil packs. I’m at 285k all original coil packs and they are burnt, puffed and cracked and are still working perfect. They have been this way for 80k.

I did have to replace the rubber components (plug boot and valve cover seal) with ones from NGK as Toyota doesn’t sell them separately.

 

You got a link or part # for the rubber components?

 

Denso OEM https://www.rockauto.com/en/moreinfo.php?pk=4718148&cc=1426935&pt=10150&jsn=393

Budget https://www.rockauto.com/en/moreinfo.php?pk=10958236&cc=1426935&pt=10150&jsn=392

 

https://www.amazon.com/LEXIVON-Swivel-Magnetic-Enhanced-LX-122/dp/B07MH5ZDMD?th=1

Used this tool a few weeks ago on the tundra and rav4, worked perfectly. Spark plugs on rockauto are cheapest and ship quickly, went with denso iridiums.

 

Spark plugs are a wear item. The old coppers wouldn't last more than 25k miles before they burnt down to nubs. The newer Platinum and Iridiums are much more durable. I do 100k mile changes on those types of plugs unless there's symptoms. Hate to wait for something to fail that's a wear item, but sounds like you've gotten a lot of bonus time out of those.

 

I'd really like to see some pics of these 166K plugs that are only supposed to last to 30K. Hopefully, they aren't seized in the block.

 

replace the plugs. asking for trouble leaving them in there 15 years!

 

I replaced mine at just over 60K miles on my 2006 DC . . . they looked fine, but did it anyways.
One thing I noticed was some were much tighter/looser than others.
That being said, I'll be checking the torque on them every 2nd or 3rd oil change from now on.

 

Saw this earlier on FB. Sorry had to black the name out. But this guy, has 300k on his Tundra and has never replaced his spark plugs until few days ago and check out his spark plugs.

 

Factory plugs on an 06 (VVTI) should be iridium, so change every 100k. But i think we all still want to see them at 166k. But I bet they still look good.

 

I changed the plugs in about one hour today. Some were barely snug and others tighter. All came out smoothly and new ones went in smoothly. Torqued to 18 ft lbs. Coils looked good . No cracks. Used the plug tool 06yotamike recommended. Worked great and the price was good. Drove a few miles after the change and could not tell any difference in performance. It was running like new before and after the change. But now I am set for my lifetime as far as plugs. LInk to old and new plugs https://www.dropbox.com/t/raYpk6DShV7U0KWc

 

What is the correct part number AND gap setting for the 05-06 V8 engines.

 

Denso SK20R11 (pre-gapped to 1.1mm)

Toyota #: 9008091180

 

I used these. Pre-gapped https://shop.advanceautoparts.com/p/denso-spark-plug-iridium-long-life-sk20r11-3297/20650324-P?clickid=Vee2r62-2xyIWSSW-X1Uy2pxUkG0FHx:IwKPx40&irgwc=1&c3ch=Affiliate&c3nid=IR-27795

I added some nufinish products to the order to qualify for the 25% off and saved $25.00

 

If you order today you can save $20 instantly without adding anything using the coupon CHRISFIX25 for Advance Auto

I think I may forego the Iridiums and get whatever the latest, better tech is, Rhodium or something? Ruthenium? Hell if I remember.

And what's the diff between the IK20TT and IK20? I forgot.

 

Thanks shifty. Just ordered some Densos (already have a stash of 8 on the shelf for the Tundra) for the Highlander. Got the IK20TT series ones as Denso Global's website noted them as appropriate for the vehicle (Owner's manual lists the FK20HBR8's). The CHRISFIX25 discount absolutely works!!!! I got 6 with tax for $44.

 

If you get 14 in city, in a 15 year old v8 over 150K, replace them with the same damn thing or the modern equiv. Thats brilliant, and why I drive toyotas.

 

I had similar confusion. Manual for my '06 calls for "KS20R11" but there is no such plug. I think it's a typo in the manual, S and K reversed and the SK20 R11. I had $5 off coupon from other stuff so went ahead and stacked it with the discount just to have a spare set on-hands. I have yet to pop my plugs out and inspect since owning the truck, no reason yet. For all I know they're brand new and I may not be swapping out for another 40k+ miles.

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After replacing the plugs I went on 308 mile trip mostly at 70 mph. Topped off with 90 octane before leaving and upon return. Used 17 gallons = 18.11 mpg