Spark plug NGK or Denso

NGK plugs have instructions on the package and do not require a torque wrench. I have a torque wrench, but I do not use it for my spark plugs. It's just hand tighten until it makes contact - then turn it however many turns they say with your socket to fully seat it (usually like ½ - ¾ turn or something like that).

You don't need a torque wrench, NGK plugs have a crush washer and specify half turn past initial contact. Did my Mazda 3 with no issues. I have a torque wrench and didn't use it.

Harbor Freight has the torque wrench you’d need for $19.99 the Pittsburgh 3/8" drive and a 3/8" drive extension set for $16.99. I’d also grab a magnetic spark plug socket from AutoZone for $14.99 (just go straight for the magnetic one, it makes life way easier).

For the spark plugs themselves, I’d stick with NGK, but make sure it’s the correct spec for your car, since they make different cx5's, some being NA and some being turbo.

As for the "paste," some people put antiseize or dielectric grease on the threads to make future removal easier. I personally skip it because I want zero chance of anything getting into the engine, plus grease can amplify the torque applied with the wrench, which is bad. I’m hoping this is what you mean by paste?

If you do it yourself, the first time costs roughly $100-120 for the tools, and still is about half of what the dealer is quoting. After that, you just pay for the spark plugs themselves for future changes, which brings the cost down to around $50-70 per change since now you'll have the tools.

Get an icon click type torque wrench from harbor freight when they have a sale. And a deep socket set for spark plugs plus dont buy your plugs on Amazon. Go to rockauto. And buy them there buy ngks also rediitt has a rockauto sub and usually people give out 5%off coupons. Also Do not use cheap aftermarket plugs on your car also you'll need a regular ratcheting wrench and extension. Never use torque wrench to loosen plugs it csn destroy the calibration

There is a noticeable improvement in performance when I cross over into the next country and refuel. This is what my denso iridium plugs look like after 20k km. I had a misfire. New plugs today, and the misfire is gone

NGK Laser Iridiums will last longer, but those aren't bad per se.

I had to put a new spark plug in mine after only a few hours of use. It had some China branded in it and I switched to NGK. Also propane creates a hard harder to jump spark gap so you generally have to narrow the gap a tiny bit from typical specs when you’re going to run propane. Since I only run propane I went down a little on the gap and it runs flawlessly. I optimize the gap width by seeing which widths responded best to a sudden surge load without hesitating.

I replaced the OEM plugs with NGK, they lasted about 15,000 miles. Burger Tuning told me that 15k is about all you'll get out of NGKs in these cars.

I have installed brand new NGK sparkplugs and Bosh ignition coils...but the cylinder 1 misfire does not move or is resolved at all.

Get rid of those ASAP. These are prone to breaking their ground straps. Myself and many many others have fell victim to this.