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Old October 17th, 2016, 02:58 AM
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ew1usnr ew1usnr is offline
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Join Date: Dec 2012
Posts: 847
Spark plug change interval

My 260 was rebuilt four years ago. It is using Autolite 45 spark plugs that now have 17,500 miles on them.
It had been my impression that the spark plugs should be changed every 25,000 miles.

Autolite 45.jpg

A friend at work gave me a Chilton's repair manual for Ford Pinto/Bobcat, 1971 -1980. That manual says:

"The average life for a spark plug is approximately 12,000 miles. This is, however, dependent on the mechanical condition of the engine, the type of fuel that is uded, and the driving conditions under which the car is used. For some people, spark plugs will last 5,000 miles and for other, 15,000 or 20,000 miles.

So, Chilton's says 20,000 miles maximum. How often do you guys change your spark plugs? Do you go by mileage intervals or just wait until the car begins to run unsteady?

Thanks, Dennis.
Dennis Pierson
Tampa, FL
"The Wonder Falcon"

'63 Futura Hardtop (260, Ford-O-Matic, bench seat)

Last edited by ew1usnr; October 17th, 2016 at 03:07 AM.
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