Getting ready to replace the Spark Plugs

Hey! Sounds like a good plan, definitely go with the Denso. We've had a good amount of people repot mpg loss with other plugs, like Bosch over the years. Denso are fantastic and will last for a very long time (as in your case)

 

denso or ngk

 

agree with both above. the oems are great plugs, and inexpensive.

 

Denso

 

Hate to open this can of worms, but was there a notice from Toyota, to go one step hotter? IIRC the 20 in the Denso plug number goes to 16?

The dry thread torque spec is 15 ft/lb, and if you use any amount of anti-seize maybe 12-13? Or just stick with dry threads?

Socket size is 9/16" or 14mm.

 

Post close up photos of the old ones here, carious minds would love to see them at 145k.

 

You were on the money, this is from the Owner's Manual:



But there was some edict, maybe Toyota found they were fouling a bit, the engine running cooler than anticipated, so they revised the 20 to 16? maybe. For starters if you phone a dealership service department, and ask, they might be able to shed light. And also will give you a price. It'll very likely be higher than most anywhere else, but it doesn't hurt to ask, and you can hopefully clear up if there has been a heat range revision.

 

Here's @The Critic 's comment, about going to hotter plug:

120000 Servicing | Page 2 | PriusChat

 

Just got new plugs directly through the Toyota dealer . (I forget the actual Toyota part #) .
The new correct plug number is SC16HR11.
I doubt the Toyota dealer would even have the SC20HR11any longer , as they have been superseded to the SC16HR11.
The dealers should have exhausted the SC20HR11's by now, and probably only have the SC16HR11's on the shelf for sale .

I knew about the new part number before I called the local Toyota dealer , but didn't even have to bring it up . They already have the new ones in the system .I just asked for new spark plugs for my 2011 gen 3, and I was sold the SC16HR11

 

I would ask dealership for price, but i find without fail other places are cheaper. Last time I was plug shopping a (Honda) dealership was around $24 per, and a small automotive retailer got them for me for around $18. Canadian prices btw, always higher.

 

If you've got Denso SC20HR11 (pretty much guaranteed) and they're not fouling, you'd continue to be fine with them. I've had ours out, around 60K kms, just for a look. Can't recall, but I'm pretty much certain they were the 20.

 

I dont have the invoice in front of me, but I think the plugs were $12. and change from the Toyota dealer .
Yes, more than one would pay at an auto parts store for spark plugs , BUT , these are the correct Denso iridium factory plugs AND only the Toyota dealer had the correct superseded Denso plugs in my area . MOST of the spark plugs you find at the autoparts stores are not technically the correct plugs for the gen 3 . Most iridium plugs (that were not even correct for the gen3) at the autoparts stores were not exactly cheap either .
I felt a little better getting the correct plugs from the Toyota Dealer , even at the slight dealer mark-up in price.
On the gen 3 , there is a lot of stuff to remove to get to the plugs .....I only wanted to do it once !