I bought this 2011 6.2L Ford Raptor about a month ago. I noticed first that the coolant had a brownish color to it in the reservoir but it didn't look like oil if I were to guess. Ford recommended I do a coolant flush, so I took it to the dealer and did exactly that. I've only driven about 200 miles since then. I looked at the reservoir again and it still looks brownish to me? When i look in the radiator though it looks green? Not sure what's going on. I added photos, any idea? I dont see any leaks coming from the car of any sort.