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I've been changing spark plugs since the 50s. Back then we changed them a lot!
I once had a '66 Dodge with a slant 6 that would foul plugs every two weeks or so. I had about 5 sets that I glass beaded at work when I ran out.
I have never used anything on plugs, although I always wipe down the threads on used plugs to clean them.
OTOH - Click and Clack do a funny discourse on those 100,000 mile plugs. "If you leave them in for 100,000 miles, they are in there FOREVER!"
They advise people to remove and reinstall plugs on a yearly bassis if they do not need to be changed. Besides, you can look at them while they are out.
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96 855R, 95 855,854, 90 744 Ti - 343,000 Volvo miles put on 7 bricks
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