How often should I change my spark plugs in Ford edge 2009?

How often should I change my spark plugs in Ford edge 2009?

What does the maintenance manual say? That is what you should go by. It probably says 100,000 miles. That is way my 2007 for Escape maintenance manual says. If you don't have a copy of your maintenance manual in the glove box then you can download it on the internet.

The usual rule of thumb is 50,000 miles or 5 years, which ever comes first.

And possibly the HT leads as well. Swap these over one at at time.