I spoke with the service manager at my dealership today. He confirmed that the thin layer of rust is expected on the f150’s and raptor. He says the light layer of rust doesn’t do any harm. It happens because the cast steel they use is untreated. WTF?! The raptor cost of the raptor doesn’t warrant Ford’s Best? The f250’s get treated though, he said. Either way I don’t like it. If I was appraising my truck for resale purposes I would doubt the accuracy of the odometer reading due to the amount of rust my rear differential was showing.
I ordered this spray solution called RUST BULLET. I got it from amazon. It breaks down rust without any scrubbing. It worked pretty good. I followed it up with some POR 15 rust remover. I was hesitant to use the Por 15 because your supposed to let thems SOAK in the Por 15 solution, for it to work. So I just sprayed some after the rust bullet. The rust bullet did All the work. Unfortunately the Por 15 anti rust coating that I ordered won’t arrive till Thursday. I hope my rear diff doesn’t start to rust up again, before it gets coated. Anyway here is before and after pics:
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