- Winnipeg Canada
- 2017 CX-9 GT
I got the plugs from Napa Auto parts right here in town. They actually had them in stock (RockAuto lists them as Currently unavailable). The dealership wanted $50 a piece but Napa sells them for $30. Not sure the Mazda logo on the spark plug is worth the extra $20 so I went with Napa.Nice, how was the job? Fairly easy/straightforward? My CX-9 just hit 53k so I've got little more time before I change mine out.
Where did you order the plugs?
It was mostly straight forward. If you see how it's done on the CX-5, it's a total breeze. The CX-9 however has stuff in the way that you need to move. I wasn't sure exactly which bolts were needed to be removed, but there's about 5 on a metal plate that sits right over spark plugs #2, #3 & #4. Also, some hoses keep you from moving it enough, so I had to remove another 2 bolts. I should take a photo and post here exactly which ones were needed to be moved. Aside from that, it's straight forward.
So I didn't use any thread anti-seize as NGK recommends against it. I did use dielectric grease on the boot of the plug. Oh, I also disconnected each spark plug wire from each ignition coil, just to make it easier to pull out the coils, although probably not necessary. I took the liberty to also put some dielectric grease around the spark plug wire connector housing, but not on the electrical conductors themselves. This will help keep moisture out and make it easier to disconnect if needed in the future. Ya, I like to take my time with these little jobs and do these little extra things that probably don't matter much.
Btw, I did notice a bit of oil on one of the plugs I pulled out. Not a lot, and it's mostly just on the end of the plug although the electrodes themselves looked clean. I believe that was plug #4. I might want to pull that plug again in about 6 months and inspect it, see if that's a real issue or not. Oil on the plugs could indicate a bad piston ring or valve guide. But it's so little that I'm not overly concerned right now. Mazda did inform me that the prior owner did the oil changes on time, so that's a bit reassuring.