Tom Weiland of Richland, MN has been using AMSOIL Signature Series 5-30 in his Ford Flex. He bought a new car, and started using Amsoil after the first few oil changes. After 350,000 miles, the engine has not required ANY replacement parts that require oil. He took his Flex for a water pump repair, and the technician opened up the front cover. The technician was surprised at what he saw. There were virtually no deposits on the engine, and it was ridiculously clean. Read More about Tom’s experience with Amsoil’s Signature Series5W-20 Synthetic Motor Oil here.