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ZERO! Along with any other brand other than Motorcraft/Beru. Many aftermarket GP's have been known to swell up and get stuck in the head. I am not willing to try any others and HOPE they come out 100K later.
If you take them now you might be able to swap them for the Motorcraft ZD-11's.
My brither did that same thing. He pulled them out the next day and returned them. Then again his wife is the manager at that store. Worth a shot in my opinion.
Exactly what TJ and Neal said do not use them. Check ebay sometimes u find the zd11s for about $60.00 per set of eight. I have them as well as a spare set just in case. Just my .02
Hey fordguy check these out ebay item #220352248988 zd11 glow plugs set of 8 no bids yet. Auction ends in 19 hours they are in Nicholasville KY, hope this helps.