Amazon has SP-515 spark plugs cheap!
#3
If you look toward the bottom of the Amazon page click on the used link. Buy used only from Amazon Warehouse Deals for $3.99 each. I have bought used spark plugs, oil filters, brake pads, air filters, motorcraft belt pulleys from Amazon Warehouse and all parts received were new but returns where someone bought the wrong part. If you don't like what you get Amazon will pay to return the item. I haven't had to return a single used (new opened) part.
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F150Torqued (07-12-2015)