Motorcraft OEM SP594 Iridium Spark Plugs (6 pack) CYFS12YRT3

Perfect fit and made a huge difference. Smoothed out the idle and throttle response

Works perfectly for my 2.7 ecoboost (2018 F-150). It took my roughly 6 months pregnant self about three hours to install, start to finish. After the grave mistake of allowing a Tire Discounters to do an oil change on my truck while I got new tires, I was having lots of issues with misfiring and my truck randomly stalling, usually coming off the interstate. That’s really not fun when you have your family in the truck with you and you’re hours away from home, heading out west to Utah and California. Oh, and you’re pulling a horse trailer. Anyways, once we arrived in Utah, we had the truck looked at. The oil had been grossly overfilled (how in the world do you manage that???) so an oil change was done and things got better… mostly. But the misfires were still an issue. We stopped again because we could hardly get above 35mph without the truck shuddering and freaking out. They narrowed it down to bad spark plugs. They replaced them and sent us on our way. Now the issue was much better. However, after less than 8,000 miles, we started having misfires again. My truck had been misfiring for quite a while, and while I believed it was the spark plugs, the next shop I took it to said it likely wasn’t. Not wanting to gamble $500 off of my best guess, I just bought these and the necessary tools to do the installation myself. I bought a spark plug… thingy… (I forgot the word, sorry, baby brain) form Menards, but I found that, while it was great for taking the spark plugs OUT, it was not good at putting the new ones IN, as it wouldn’t let them go without leaving the aforementioned thingy in there. Thankfully, I had a Quinn brand set of thingies, and the right size was in there. That one worked much better for putting the spark plugs in. Once I had that issue figured out (that was the bulk of what took so long - trying to get the spark plug, and only the spark plug, in) the installation went very smoothly and quickly. I then drove my truck straight through to Oklahoma from Kentucky with a horse trailer, and then straight back to Kentucky the following day. No more misfires! I have also driven, again with a horse trailer, straight through from Kentucky to New York without a single incidence of a misfire. I think I’ve done about 10,000 miles with these, and I’ve not had a single issue! I have included a photo of these side-by-side with the spark plugs I removed. So glad I listened to the forum conversations I read and bought OEM! My truck seems much happier, and they have already outlasted the non OEM spark plugs that were installed before.

The plugs arrived right on schedule. I checked the gaps on them as I was installing them. Each one was perfect and each one measured the suggested gap. Installation went smoothly and between the new plugs and cleaning the MAF and MAP sensors, the truck idles smoothly and accelerates without hesitation. The price was better than the parts stores in town, so another win.

oem spark plugs for my 2020 Lincoln Navigator L Reseve worked great i match them with standar motro product boots

The original plugs in my 2018 F150 3.5 EcoBoost looked to be in good shape at 122K miles. I wanted OEM Motorcraft plugs. Normally, I’d do NGK’s but lots of reading on forums convinced me to stick with OEM. Not tough to swap these in. Just blew out the recessed original plug area with compressed air before removing the old plug. Took maybe 35-40 minutes to do all six plugs. Should be good for another 100K miles.

The plugs fit well. Went right in and so far are working fine. The packaging was a little banged up when it arrived i was worried about damage but so far so good

Definitely buy again

Works on 2.7 ecoboost f150