Yeah, I know. And I don't mean to rub any salt in those Ford owner's wounds.
But it is a vivid "nightmare" illustration of what happens when the plug won't/can't come out.
I also subscribe to the "turtle cooking" scenario for plugs. The decline is so gradual that most drivers never notice. While the plug is still "good" at 100k, it's probably not as efficient as it was at 50k. With gas at $3-4 gallon, on a bigger thirsty V8, the fuel savings across 50k might justify the early change v. the 50% cost amortization on eight plugs.
Generally, spark plugs are pretty inexpensive parts as parts go.
But it is a vivid "nightmare" illustration of what happens when the plug won't/can't come out.
I also subscribe to the "turtle cooking" scenario for plugs. The decline is so gradual that most drivers never notice. While the plug is still "good" at 100k, it's probably not as efficient as it was at 50k. With gas at $3-4 gallon, on a bigger thirsty V8, the fuel savings across 50k might justify the early change v. the 50% cost amortization on eight plugs.
Generally, spark plugs are pretty inexpensive parts as parts go.