Picked up a brand new motorhome today that had been in stock at the dealers for a few months, but I was surprised to find when I looked at the (Ford) engine that, instead of being shiny and immaculate as expected, it was liberally covered in what appears to be corrosion. It's a fine white dust that you can scrape off with your fingernail, but it's everywhere, and there are some brown corrosion stains as well coming from the bolts. Is this normal? I'm sure it's just cosmetic/surface "rust", but it doesn't look right.