1998 ford ignition lasted 186000 miles before I changed the spark plugs. The ceramic was cracked and the anodes were all worn, with gaps exceeding 1/4". My mileage was still factory before and after. I would expect that from the brands you listed too.
1998 ford ignition lasted 186000 miles before I changed the spark plugs. The ceramic was cracked and the anodes were all worn, with gaps exceeding 1/4". My mileage was still factory before and after. I would expect that from the brands you listed too.