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Nick Stageberg wasn’t happy to hear his 2003 F-250 Powerstroke Diesel making a strange whistling noise just days after buying it at auction. With the help of a friend, his investigation uncovered some mechanical fraud by a sneaky mechanic looking to get rid of a piece of junk. The fraudulent mechanic had plugged up all the ports of the coolant reservoir with RTV silicone in an attempt to hide the oil cooler or head gasket failure. This kept the oil-contaminated coolant from entering the reservoir and kept the problem hidden long enough for the car to be sold.