Good morning, hope you're all having a nice and meaningful Thanksgiving. I have a place that can clean and FAA certify oil coolers. They're CLEAN! If you want to send it to me, I can get it cleaned. He doesn't deal with the public. If you're sure it doesn't have any leaks, this could be a good way to go. Price depends on size. Small ones are usually under 50 bucks. HTH, John