Just changed the plugs in my '97 4Runner. There were 2 different brands, one side had ND's, the other side NGK's. These are original plugs, I'm the original owner. Ask the local dealer if he heard about this, said no. Parts fiche only showed one plug, ND's #K16TR11. I also remember reading in the service manual something about two different plugs. Anyone know anything about this? Why 2 different plugs? Inquiring minds want to know. Thanks!

 

NDs?

I knwo that people have found NGKs and Densos. the explanation was, Denso owns NGK. The heads were probably assembled at different times/places, so they mightve been using a different plug.

 

Nippon Denso

Nippon being Japan

 

In that case, my explanation works perfectly.

 

All the 3rd gens come like that...3 Densos on one side...3 NGKs on the other...weird, but that is all I've seen.

Just replace them all w/ one or the other.