Synthetic, Synthetic Blend and Mineral Based Oils March 28, 2003, 12:43:58 pm Yahoo Message Number: 20426Just a point of clarification on the subject of motor oils. Amsoil is a pure synthetic. The Ford OEM Motorcraft 5W 20 oil is a blend of synthetic and mineral oil. One has to decide on the cost benefits derived from the choice of the two; Higher upfront cost of synthetic and less frequent oil changes or lower upfront costs with more frequent oil changes with a blend or mineral based oil. This is always a popular subject for debate. Perhaps we can start a database on oil types used and the frequency of change.Malcolm 2002 MB