Plug life

TBirdDriver

Registered User
At what intervals should I replace my plugs. I run the motorcraft double platinums with magnecor wires.
I put fresh plugs / wires in 34,000 miles ago. (Car has 98,000 miles on it)
99% of my driving is highway miles cruising at 75 or so, 800 miles a week, 93 octane gas.
 
i was wondering the same thing? i replaced mine like 3-4 years ago with the same thing you got.i figure i,ll replace mine when when it starts bucking...
 
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