Optimized Motorcraft SP-412 Spark Plug Review

Installed today with no problems. Mustang works great. I hardly give it gas and it accelerates. It took a while before it even picked up speed.

Very poor quality product. After installation, after 2 days of driving, two candles cracked. Went to the dealer and bought all six again. The dealer hasn't had any problems with them so far.

Motocraft spark plugs are great! Mine has done over 100,000 miles with great performance in my Mustang. I definitely recommend them. just don't order from Revain 🤨. As you can see in the photo they arrived with two boxes, a little wrinkled, and one completely disassembled. There was no bubble wrap or paper in the shipper. Unacceptable!

Replaced spark plugs and wires on my 2006 Ford Explorer v6 4.0L. About a week after the truck stalled, I thought it was the transmission and took action to fix it. I've let it run occasionally and haven't had any major problems until last week when the spudder came back and it was heavy again. Then the check engine light came on indicating a misfire on cylinder #3, pulled out the spark plug and the porcelain was broken and cracked in 3 different places. Shotguns, so be careful, there will be a…