Re: Sorry for The Dumb Question
Sr Williams, I am here in Fresno, CA & we have been getting fog every morning & early in the evening so I know a lot about fog. Spark plugs per the scheduled maintenance on your XF should be done every 100,000 miles. I don't know anything about the Eurocharge process but the information you received with your Eurocharge should tell you what you need. I'm sure someone else will be able to help you. There are no dumb questions, just dumb answers like this one.
Stan