2011 TRD Sport factory spark plugs???

I changed the plugs on my Taco last night. I pulled one from the driver side and ran up to the dealer with my sample. It was an NGK. The parts guy informed me that they use Denso plugs now. I bought six. I changed the driver side NGK plugs, replacing them with the new Denso ones. When I pulled the first plug on the passenger side, I noticed it was a Denso. The exact same as the six I'd just gotten from the dealer. All three on the passenger side were Denso plugs??

I kind of remember reading something like this on Taco World way back when I bought my truck but can't seem to find the thread. Any ideas why they'd do this at the factory? Were the heads built in different factories? Weird!

 

2 heads are done in different factories

 

Hahaha, I guess it was explained above, but yeah, that strikes me as odd.

 

Chris4x4 has an excellent write up on this.

https://www.tacomaworld.com/threads/how-to-spark-plug-change-1-gr-fe.30479/

 

It's normal for your truck.

 

No.

They split between Denso and NGK and maintain them as suppliers. They have always done this on the Tacoma six bangers.