With our 2017 MDX coming up on 100,000 miles, I decided to tackle the job of changing the spark plugs. I ordered the OEM laser iridium plugs for much cheaper on Amazon from a few months ago (DILZKR7B11G 95350) although I noticed that particular set it out of stock now.

Finding a good video on YouTube was difficult. I finally came across this video which I found very helpful, and I imagine there are similar videos for this 3.5L V6 on the Pilot and Odyssey.

Some additional thoughts/tips:

• Use one 3" 5/8 extension with a joint to your spark plug socket. It's just the right length for ratcheting and hand-spinning the plugs in and out.
• Invest in a magnetic plug socket. I used my socket with the rubber ring and promptly lost my socket when pulling it out. I removed the spark plug, taped the socket to the extension, and carefully pulled it away after tightening the plug once more.
• I used the handle end of my ratchet to push the coil pack connector down. It makes an audible "click" sound and then can be easily pulled out of the way. For the most part, this approach worked really well. However, the left (passenger) back bank just wouldn't separate. I'd hear it click, but then would not pull off. I finally got it to separate, but I found out later that it would not stay connected tightly once I reconnected it. Lesson learned: Keep the pressure at the top of the rubber connector and be careful not to break the clip.
• You'll need a right-angle ratcheting driver to remove the radiator fan cover so there is enough room to pull out the middle front coil. I tried at first just pulling the radiator fan forward, but ended up just removing the cover.
• Use a 3/8" or smaller torque wrench. I was terribly worried about over-torquing the plugs.
• Anti-seize or not? Googling around indicated NGK plugs don't have anti-seize applied in the factory, so I opted not to use it here.

The old plugs didn't look too bad, especially after 100K miles.

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• The engine runs smoothly, but it may need a valve adjustment. I'll see on the next fillup if mileage improves -- I average 18 MPG in mostly suburban driving.

Hopefully this helps anyone else looking to get this job done!

 

Watch out for counterfeit spark plugs on Amazon.

Hammer a small fridge magnet into a regular 5/8" socket to make your own magnetic spark plug socket.

Anti-seize is probably not necessary in TX. Up here in New England, pretty much everything gets anti-seize if you want to be able to remove it later. \

Always good to see someone doing their own car maintenance instead of paying shop labor.

 

Regarding the back bank - a mirror is helpful just to take a look, but going by feel is easier than having someone hold a mirror while navigating the back bank. The ignition coils and their 10mm bolt heads are easily accessible, so it was straightforward enough to navigate by touch with my left hand and then position the socket accordingly. Surprisingly, there is a decent amount of room for a medium-size ratchet to loosen or tighten the plugs and bolt.