When Do You Plan to Replace Spark Plugs?

[SteveS]

Thanks for the informative and valud response. I completely understand OEM not being the correct term.

FYI, the M5 is in my top three favored vehicles.

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[shine]

I'll be curious to see if Toyota still puts two different brand spark plugs into their engines like they did on my 2008 1GR-FE.

That one was shipped from the factory with 3 NGK and 3 Denso plugs...

 

[TMLifer]

I'll be curious to see if Toyota still puts two different brand spark plugs into their engines like they did on my 2008 1GR-FE.

That one was shipped from the factory with 3 NGK and 3 Denso plugs...

Surprising to hear they would use two different brands of spark plugs in the engine from the factory. I'm wondering if it there was an inventory or supply chain issue at the time. But I guess if both brands are OEM and produced to Toyota specs, it should have been fine.

 

[morsk]

A few people have mentioned a 'maintenence manual'

Where can I find this, or can you attach in this thread? Can't find it online and the Owner's Manual does not specify the change interval

 

[TMLifer]

A few people have mentioned a 'maintenence manual'

Where can I find this, or can you attach in this thread? Can't find it online and the Owner's Manual does not specify the change interval

Non-Hybrid:
https://assets.sia.toyota.com/publications/en/omms-s/T-MMS-254Runner/pdf/T-MMS-254Runner.pdf

https://assets.sipb.toyota.com/publications/en/omms-s/T-MMS-264Runner/pdf/T-MMS-264Runner.pdf

Hybrid:
https://assets.sipb.toyota.com/publications/en/omms-s/T-MMS-254RunnerHV/pdf/T-MMS-254RunnerHV.pdf

https://assets.sipb.toyota.com/publications/en/omms-s/T-MMS-264RunnerHV/pdf/T-MMS-264RunnerHV.pdf

Maintenance chart starts on Page 38. The maintenance manual should be the same for 2025 and 2026, but I included the links for both model years.

 

[Nodak]

denso is oem for spark plugs for toyota since toyota (automobiles) owns i think 20% of denso

other toyota industries own stake in denso also

denso is considered a Tier 1 supplier for toyota and not just for spark plugs

toyota's original parts division was spun off to denso

Toyota held about 24% of Denso’s total shares as of the end of September, according to Nikkei Asia, while Toyota Industries owned a 9% stake and Aisin 2%. Toyota, however, is expected to remain Denso’s largest shareholder after the sale is complete, according to Reuters.

The sale would reduce Toyota’s holding in Denso to around 20% and lower its holdings to about 20%, with Toyota Industries’ stake dropping to around 5%. Aisin, however, is considering selling all of its stake in Denso, according to Nikkei Asia.

 

[127.0.0.1]

Surprising to hear they would use two different brands of spark plugs in the engine from the factory. I'm wondering if it there was an inventory or supply chain issue at the time. But I guess if both brands are OEM and produced to Toyota specs, it should have been fine.

no, it's not a supply chain issue. it's an agreement

both my 99 4runner and 2013 tacoma, [both v6], had
NGK on one bank and denso on the other bank, from factory
Toyota has been doing this for ages...

I don't know if they do this for inline engines

 

[Joe Dirt]

Piece of cake to change the spark plugs on this new four-cylinder.

I have a gas model and at 30k I probably will just remove one plug and take a gander at it to see if any carbon buildup it's happening because of my short around town drives.
I would guess the usual Gray Ash color.

 

[bakutheleo]

Nice to hear it is easy (obviously I have not bothered to look yet!). My first car was an '84 Honda Civic. Tiny engine, easy to stand in front and reach the rear without climbing in. Four plugs were right in front--so easy.

I also had a'98 Ford Explorer for quite a few years (really liked it)--I recall its plug replacement schedule was an insane 100,000 miles. But I also heard it was horrendous to do. I am pretty sure I had over 100K miles on it when I sold it, but I do not recall getting the plugs changed. I must have, but did not do it myself.

 

[SC4Runner]

I believe it’s going to depend on your modifications, towing and off-roading. I’m planning a 25k change and every 25k-30k thereafter. I’ve updated a lot under the hood, and tow and off-road a little bit. The LC forums are showing a definite need at 40k.

I will come back to this form in about 5k when I hit 25k to let you see what the plugs look like. I’m in the process of differentials, transmission and transfer case fluids, and all of those have looked really good so far!

FWIW, most 4R owners I know have said to change your diff and transmission fluids every 20k-30k and keep an eye on spark plugs, change as needed.

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