chicken
SHEOOOOOOOOT
ok well i didnt wanna totally hijack the thread but heres my personal bosch experience, my 97 bird 4.6 ran great, did plugs still ran great after 10k or so i was just cruising down the interstate doing about 80, when the spark plug in cly #4 dropped the porcelain into the cly and eventually holding the exhaust valve open. had to pull the head check the valve etc. i checked all the plugs car wasn't running lean, no reasons for it to fail. also had a couple 2.3 rangers where the insulator has blown out of the metal sleeve in the head and one caught fire, when the wire stayed attached to insulator kept firing off the side of the head and gas sprayed out of the hole, fire bad!!!! also neither i or anyone else has ever gotten a refund for even the plugs let alone the added cost from the spark plugs failing