nationalgallery
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I had 4 Navigators with power running boards over a 20 yr period, and I have a 10+ min. drive to and from my house on a country dirt/gravel/muddy/snowy road. I would thoroughly wash the deploying mechanisms with the hose and then spray with WD40 usually every 3-4 months, and never had a problem except with one running board (motor failure) which was replaced under warranty. I plan to do the same with this Expedition.