Hey Scotty! wanted to thank you for the 2000 mustang GT review that helped convince my parents to me buying a pretty well maintained 2001 mustang V6 automatic with only 49K miles. We had it taken to a mechanic before we bought it no codes and no leaks at all dry as bones down there he said it was in very good condition. The vehicle was most likely an older gentlemen's car from Florida and was sold at auction to a dealership near my location the vehicle was garage kept. I wanted to know if we could use the Full synthetic 5W-20 oil on the mustang or if it would harm the engine somehow.