Autolite 3924 Spark Plug Copper Core (4 Pack)

These spark plugs were recommended by my engine manufacturer and so far are working as expected.

Remember to adjust the spark gap !At first I install without adjusting the gap. The car runs but with poor acceleration( weak power).Then I dick up the old ones from my garbage can, and match up the spark plug gap then reinstall, Whoa La!! the car run just like a new engine.Cooper plug in fact has a better conductivity then the platinum one; hence, better performance. Only that cooper has shorter life. But with price like this, I wouldn’t mind to change them every few years.

Good fit , just very minor gap adjustment for my Yaris

Fit perfect

Good value. No packaging. Just a plastic bag. That's ok no damage.

True product thought it was to good to be true I was wrong ford plugs times 10 coils look solid will write another review after I put them in

The product was recommended by a manufacturer for their product so I purchased it. It fits and functions well. I’d highly recommend the plug.

I wouldn’t change a thang