Re: Spark Plugs
If the car has platinum plugs in it you shouldn't need to change the plugs until the car has 100,000 miles or more on it. I have been using platinum plugs (usually Bosch) for about the last 15 years and have never had to replace a set with less than 100,000 miles on them and most of the time they will run 110,000-150,000 miles without any drop in FE. I just took a set out of my '88 Escort a few weeks ago that had been in it for about 150,000 miles and wouldn't have changed them then except the insulator on one of them cracked and was causing a bad miss. Also in most cases wires don't need to be changed unless you have a bad wire. I'm using the best quality set of Auto Zone wires on my '88 Escort and they have a lifetime warranty and will be replaced at no charge. If you do change the plugs be sure to use anti seize on the threads. I had a plug seize up in the aluminum once and strip the threads out of the spark plug hole.