Possible COUNTERFEIT DENSO "U Groove" sparkplug KJ16CR-L11? Bought from authorized dealer, Advance Auto Parts

[slacktide_bitog]

The plug number doesn't have a "U" in it. So it isn't a "U" grove plug.

As an example, my motorcycle plug is W24ES-U.

My Tacoma (4.0 Lt. V6) from the factory came with NGK plugs on the pass. side and Denso plugs on the driver's side.

I can tell you this that the NGK center electrode wore faster than the Denso. These plugs have coil on plug.

Like most people with this engine, I use Denso "U" grove in all cyl.

The plug change is every 30,00 miles. by the manual.

No iridium plugs used in this engine unless you're using a supercharger.

The 4 cyl. does use a "U" grove plug with I think 100,000-mile replacement

Tom B

Was the NGK on your Tacoma a V-Power?

Because those V-Powers do wear quickly. It's supposed to be like a finewire regular nickel "copper" plug. That's the reason most finewires are platinum or iridium--because a small nickel electrode has a short lifespan.

Denso uses a full center electrode. More electrode, more lifespan. Cutting the U-groove into the ground rather the center helps a lot.

If the plugs are difficult to change in your Tacoma, use iridium. If not, use NGK G-Power or Denso Platinum TT