I have had my 2007 4Runner for a couple of years and when I bought it it has a great service history. One thing I noticed was there was not much more that oil changes. So I bought spark plugs for it, then a divorce and moving got in the way. Any way, I stumbled across the plugs this week so I changed the plugs. I had Denso on the passenger and NGK on the drivers side. Do you think that these plugs really lasted 231,000 miles? Odometer pic for proof.
2007 spark plugs
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montijo505
Senior Member
That is how it comes from the factory, so I would say they were never changed. I’ve never heard of anyone buying the different plugs when replacing them, but stranger things have happened.
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fulltimervexplorer
New member
Thats impressive lasting that long. How does it feel now 231k later?
AuSeeker
Elite Member
It appears that you posted this twice, I replied to the other post but I will paste my reply here as well.
"Yes those should/would be the original plugs, The left and right heads came from different factories in Japan and for whatever reason the 2 factories had different brand spark plugs which were installed in the heads before being shipped to where they did engine assembly.
It's possible that a Toyota dealership, a independent garage or a previous owner stocked or purchased both brands and replaced plugs per what was installed at the factory but I highly doubt that's the case.
BUT, don't wait that long to do another replacement of the plugs, copper plugs which is what is specified for the V6 should be replace at 30,000 miles."
Wardbird
Member
I was surprised when I saw this post. I went back and you are right the recommendation is 30k miles. I doubt mine have ever been changed, at 85k now. I will need to attend to this as I have noticed gas mileage has gone down a bit over the last year, which may or may not be related. But, I've only had it for a bit more than a year. I would have thought they would not need changing until the 100k mark, which is the standard for many vehicles today.
AuSeeker
Elite Member
Most are surprised as well, what is more surprising when using iridium plugs most think they are good for 90,000 to 100,000 miles....but for Denso plugs even with the "Longlife" iridium plugs for our T4Rs they're only good for 100,000km/62,000+miles, and even more surprising if using the regular Denso iridium plugs they're only good for 20,000km/12,000+miles.....BUT I would suspect that either would last much longer than what Denso recommends in our T4R since these engines seems to run so efficiently and seeing how many here have posted their old plugs with many having 100s of 1000s of miles on many of the OEM plugs and the engine was still seemingly to be running OK for the most part!!
Denso web page to search for spark plugs for our T4Rs , you can search for both the "short" and "long" part numbers as well as other Denso parts...
Find My Part
Denso's "Service Life" web page...
Service Life | Basic Knowledge | SPARK PLUG | Automotive Service Parts and Accessories | DENSO Global Website
I would assume iridium plugs from other brands have a similar lifespan, but I haven't found a reference service life page on other brands.
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Stampeed Valkyrie
New member
231k on factory plugs.. lol well you got your $$ out of them that is for sure.
I just did a plug swap on an 08 SR5 with 134k and the plugs were the same.
I thought that was really weird but now not so much.
high score thread..
I just did a plug swap on an 08 SR5 with 134k and the plugs were the same.
I thought that was really weird but now not so much.
high score thread..
Stinson.mr
New member
2008 V8 4Runner Maintenance
The car is still passing smog inspections with 130000 miles with lots of trailer pulling.
Things that I have never touched:
Spark plugs
Power Steering fluid
Transmission fluid
Differential and transfer case fluid
Suspension system
Regular oil change, air filter, brakes, tires, battery, timing belt have all been addressed.
It still has great performance, smooth running and quick start.
Are spark plugs really necessary???
The car is still passing smog inspections with 130000 miles with lots of trailer pulling.
Things that I have never touched:
Spark plugs
Power Steering fluid
Transmission fluid
Differential and transfer case fluid
Suspension system
Regular oil change, air filter, brakes, tires, battery, timing belt have all been addressed.
It still has great performance, smooth running and quick start.
Are spark plugs really necessary???
AuSeeker
Elite Member
Spark plugs are a regular maintenance item, just like changing the oil regularly, if the plugs haven't been replaced in the last 40,000 to 60,000 miles on a T4R V8 with iridium plugs then yes they need to the done.
