I will only use Motorcraft glow plugs in my customers vehicles and this is by far the cheapest I have found them. They work great for a very long time.
I have been having problems with cold starts since I bought the truck and figured it was the glow plugs, but as long as I kept it plugged in she started fine. Well I finally decided to tackle this project and it was worth every penny. I highly suggest these over any other brand, because the burnt glow plugs I removed were Autolites. The Motorcraft one glow plugs install much easier, they won't swell like the Autolites and they will last much longer. Starting has been a breeze since installing these. Highly recommended.