MAS Set of 8 Ignition Coils Brown boots DG521 and Motorcraft SP-509 Spark Plugs Compatible with Ford Expedition F-150 Super Duty F-250 F-350 F-450 F-550 F53 4.6L 5.4L C1659 DG521

Very good muy bueno

They fit perfectly.

I removed 8 working coils with 278,000 miles on them and installed these new coils. After 6 months I have had to replace the new coils with the original coils 1 at a time as they start to break down. At this time I have 3 left on the engine out of the 8. I wish Amazon would take a little of the money they are making and do a little research on what products they are selling and maybe get rid of some of the junk that is being sold on Amazon. Coils should last a little longer than 7 months.

Put these on an '08 F350 with over 280k miles and the new ignition system really woke the truck up. Later sold the truck after upgrading and the next owner is still working it hard without issue. Also, the 3 valve engines these are for are the improved head design over the 2 valve with aluminum heads that often spit plugs out. Easy to install and good quality coils along with oem plugs.

I couldn't believe the prices at the the other over the counter and online stores. Plugs going for $8 to $12 dollars a piece and coils costing $40 to $90 each. When I saw the Amazon listing for less than half what the others were charging I figured they were going to be cheap knockoffs. I though they would show up in a baggie wrapped in Chinese newspaper. All I can say is WOW! Great presentation. So then I thought it's probably lipstick on a pig. Wrong again! The plugs are original or sure. Not damaged and all were gapped correctly. The coils all ohmed correctly and were identical to the factory coils that I was replacing. I've done about 2000 miles and not a miss. I still can't figure out why there is such a price difference. For now, I am extremely satisfied.

Initially ordered and when the package came it was missing the spark plugs. They had to resend the item and I had to return the last delivery. Long story short the one that came was in a different package and packaged way different than the first time. The product worked as it should though just annoying to go through the extra step. Good quality and easy to install .

Ignition Coils DG521 and Motorcraft spark plugs review:I installed these after discovering that one of the cylinders in my 2009 F-150 (5.4 V8 Triton) wasn't firing. The installation was fairly easy (it took about an hour at a leisurely pace), and it fixed the misfire issue immediately (as expected).However, within 6 months of replacing the plugs and coils, my transmission coolant lines broke precisely where they are known to fail. Clearly, the mechanic who worked on the truck broke them for job security. So just be warned - if your engine misfires, don't hire me to fix it!

I was going to do the install myself, but after discovering my 2010 F-150 5.4L Triton had the factory original 9/16” plugs, which are prone to snapping off if not handled correctly. I just lost confidence and figured my mechanic would have the proper extraction tool ($600) and an extra hour to deal with each one that might break.The good news is that I can do the next plugs since the replacements fixed the design flaw!The coils and plugs took care of the misfiring and my MPG went up around 2.5 MPG overall.All in all, I am very happy with the product.