I have always received NGK plugs in the red Honda box when buying from Honda. Here’s what I just got:

 

I've always got pre-gapped NGK plugs from Honda Dealers. Cars and Motorcycles.

 

Begs question, what makes a part oem? Honda can change suppliers. They can do this in the middle of production. They can do it years later.

So I suppose both ngk and denso are oem.

 

I bet there is zero difference when using them in the S2000, but in the Motorcycle world Denso spark plugs sometimes have a little edge over NGK. I prefer Denso.

 

Not in 2-stroke engines. I used to race MX. And NGK foul the least in races, in my experience.

 

Thanks for the hint. My last expirience with two strokes was in 1988. Time Flys....

 

The plugs I removed from my 2006 car at just under 40,000 miles (so I'm guessing were OE) back in 2014 were Denso PK22PR-L11S -- just like pictured in post #1. For some reason I saved them. Current plugs are NGK PFR7G-11S (also pictured above).

Both plugs are listed in the Service Manual as "Standard or New."

Everything seems (and seemed) normal.

-- Chuck

 

When I replaced my plugs, I also used NGK 7772 PFR7G-11S Laser Platinum. The car ran fine before and after.

Other spark plug notes: torque to 21-24 lb-ft, not less! If I remember correctly, the early AP1 service manual specified a lower torque which may cause them to back out. Gap = .039" - .043"

 

Denso are very good spark plugs. I just never seen a Honda OEM pre-gapped box with those plugs.

But, then I usually don't buy pre-gapped plugs from the dealer for my cars. Only the "R" plugs for my bikes. And those have always been NGK. For whatever that is worth.

Just being crotchety.

 

My Toyotas all came with Denso in them and I have replaced with Denso. Very good products and equal at minimum to NGK so I would not worry regardless of which one I received. I am not sure what came in my s2k originally since I bought it with 100,000 miles on it. The previous owner had replaced with the NGK which are of course, great plugs.

I think at some point Toyota went to a mix of NGK and Denso. But again, both are perfectly fine