I recently purchased a 2007 V6 4wd sport with 26,000 miles onit. I was looking at the recemmended 30,000 mile service and see that it calls for a spark plug change. I was amazed because all of my recent vehicles did not call for a plug change until 100,000 miles. If the truck is running fine is it really necessary to change the plugs at 30,000 or can it wait .
How Important is it?
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PaulB-2006 T4R
New member
Many guys wait or like me thought the plugs were good for 100,000 miles until reading this site, I changed my plugs at 55,000. Conventional spark plugs are good for 30,000 miles or 2 years given this and your engine still under warranty I would suggest you change your spark plugs to an iridium plug which is good for 100,000 miles.
There are other postings that will greatly reduce your frustrations and help you change your spark plugs.
There are other postings that will greatly reduce your frustrations and help you change your spark plugs.
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lewjonesrd25
New member
It is for emission purposes. The v6 uses copper core plugs instead of platinum or iridium which can go 100,000 miles. I change mine every 45,000, which I have done twice and each time the plugs were close to the recommended gap.
gm350reratliff
New member
I replace mine at the recommended 30k mark. Both times I have replaced them they still look new but I'm not messing with the schedule. I replace with OEM plugs. They are cheap and easy to do so I might as well just do it.
CookieRoe
Senior Member
Congrats on your purchase!! As mentioned before, the V6 came with "conventional plugs" that last 30K miles. The V8 models (as well as many modern cars nowadays) come with iridium plugs that last 100K miles. The manufacture recommends the "conventional" plug so just still with that.
Whew!! That was insightful, thanks!! :jk:
EDIT: I would say it's important, but on my rig, the originals lasted about 78K. I noticed when I took them out that I had NGKs on one side and DENSOS on the other. This is how they come from the factory. My service history says they were changed, but I don't believe it. Why would a decent toyota mechanic would stick to the two different manufactures plug? Very strange. Anyway, my engine was smoother after I changed my plugs.
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