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Which Spark Plugs for Prius #5434091 05/20/20 11:57 AM
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diyjake Offline OP
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My 2008 Prius is almost at 100K miles and I want to replace the Spark Plugs. i plan to stick with Denso / NGK. Rockauto has a few options for Iridium plugs, which are the best ones to get:

DENSO 5303 Iridium Power: $4.72 each

DENSO 4701 Iridium TT: $5.38 each

DENSO 3324 Iridium Long Life: $5.71 each

NGK 5464 Iridium IX: $5.23 each

NGK 4996 Laser Iridium: $5.89 each

Should I use anti-seize? Anyone know the torque specs for the spark plugs on a 2008 Prius?

Last edited by diyjake; 05/20/20 11:59 AM.
Re: Which Spark Plugs for Prius [Re: diyjake] #5434097 05/20/20 12:04 PM
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nthach Offline
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Stick to the factory Denso/NGK long-life iridium plugs and not lose sleep over it. It's a Prius, no special plugs needed but I wouldn't install the Iridium Power/IX series. I have the NGK Laser Iridiums and they get the job done.

I've used the Platinum TT plugs, I haven't used the iridium ones.

NGK and Denso say no anti-seize is needed but a teeny bit doesn't hurt.

Re: Which Spark Plugs for Prius [Re: diyjake] #5434098 05/20/20 12:05 PM
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dubber09 Offline
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- I'd go with DENSO 4701 Iridium TT
- check torque at Denso website
- no anti-seize


Kia Sportage 2014 GDI 2.4L
Kia Forte 2014 MPI 1.8L
Re: Which Spark Plugs for Prius [Re: diyjake] #5434099 05/20/20 12:05 PM
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Imp4 Offline
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Both Denso SK16R11 and NGK IFR5A11 are listed in your owner's manual.
You won't be wrong with going with either of those.
You could also just remove one from the engine and read it.

Also, I believe both Denso and NGK specifically state to NOT use anti-sieze because the spark plugs come coated from the factory and, more importantly, the anti-sieze will alter the torque value required to seat the plugs. The result being overtightened plugs.

Good luck!!!
cheers

Re: Which Spark Plugs for Prius [Re: diyjake] #5434109 05/20/20 12:16 PM
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diyjake Offline OP
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Thanks Gents! I know Toyota uses Iridium plugs but I wasn't sure which ones and what the difference is between Iridium TT or Iridium IX or iridium Power.

Re: Which Spark Plugs for Prius [Re: diyjake] #5434111 05/20/20 12:18 PM
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hallstevenson Online Content
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Use the same ones that are in it currently (or the alternate listed in the manual, as mentioned by Imp4). They lasted 100k miles so they seem to be 'okay' plugs, huh ?

Use a small dab of anti-seize. No idea about the torque spec but between 15-20 should be fine. I believe that either NGK or Denso puts the torque spec on the box the plugs come in.

Re: Which Spark Plugs for Prius [Re: hallstevenson] #5434114 05/20/20 12:22 PM
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kschachn Online Content
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Originally Posted by hallstevenson
Use a small dab of anti-seize. No idea about the torque spec but between 15-20 should be fine. I believe that either NGK or Denso puts the torque spec on the box the plugs come in.

Even better they give you a turning angle which makes it irrelevant if you use anti-seize or not, and you don't need a torque wrench.


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Re: Which Spark Plugs for Prius [Re: kschachn] #5434118 05/20/20 12:27 PM
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[/quote] Even better they give you a torque angle which makes it irrelevant if you use anti-seize or not, and you don't need a torque wrench.[/quote]

You will feel it when it is tight and cannot move, don't force it just snug it a little.


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Re: Which Spark Plugs for Prius [Re: diyjake] #5434137 05/20/20 12:51 PM
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oem


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Re: Which Spark Plugs for Prius [Re: diyjake] #5434144 05/20/20 12:56 PM
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The Critic Offline
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Denso 3324, and I think I have an extra pack that I have been trying to get rid of.


2011 Toyota Prius 1.8L - 207K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 146K - Valvoline Premium Blue Restore 10W-30
Re: Which Spark Plugs for Prius [Re: The Critic] #5434173 05/20/20 01:21 PM
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diyjake Offline OP
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Originally Posted by The Critic
Denso 3324, and I think I have an extra pack that I have been trying to get rid of.


pack of one or four?

Re: Which Spark Plugs for Prius [Re: diyjake] #5434180 05/20/20 01:29 PM
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NGK Laser Iridium!!!


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Re: Which Spark Plugs for Prius [Re: diyjake] #5434185 05/20/20 01:36 PM
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doitmyself Offline
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Study the current 2 threads about counterfeit Denso and NGK plugs and be mindful of where you buy them from!

Re: Which Spark Plugs for Prius [Re: diyjake] #5434198 05/20/20 01:50 PM
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Denso SK16R11 (3324) from your dealer would be my choice. Isn't that what the owner's manual calls for?


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Re: Which Spark Plugs for Prius [Re: diyjake] #5434213 05/20/20 02:13 PM
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The Critic Offline
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Originally Posted by diyjake
Originally Posted by The Critic
Denso 3324, and I think I have an extra pack that I have been trying to get rid of.


pack of one or four?

Pack of 4


2011 Toyota Prius 1.8L - 207K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 146K - Valvoline Premium Blue Restore 10W-30
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