My 2020 Dodge 3500 has 12,000 miles on it and I check the air filter because my wife hit a bunch of butterfly's on her way home from riding her horse , It took me all day to get them off the outside of the truck. So I figured I should check the air filter and sure enough the air box was full , but what I don't understand is why is the filter covered with oil? That can't be right, so I kept the old fitter should take it to the dealer ? Has this happen to anyone else ,please advise.