Motormouth: Changing spark plugs early isn t necessary
By Motormouth Bob Weber Text size Copy shortlink:
Q: In a recent column you told a reader that he should not need to replace platinum-tipped spark plugs until the manufacturer-recommended 60,000 miles. The dissimilar metals in the aluminum heads and the spark plug materials make removal of the plugs difficult which means potentially costly. Isn t waiting going to end up being more expensive?
A: Although they are dissimilar metals, the steel spark plug shells seldom seize with the aluminum cylinder heads. Mechanics used to apply anti-seize compound to the spark plug threads (some still do), but most plugs are treated and no longer require it. One notorious problem, however, was the Ford Navistar engine on which spark plugs extended extra far into the combustion chambers. A buildup of carbon made them nearly impossible to remove without damage. That is a case where the pro
Motormouth: Spark plug problem
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