i AM NEW TO THE SITE AND DONT KNOW QUITE HOW TO MANEUVER AROUND ! i AM TRYING TO FIND OUT IF ITS SAFE TO USE SYNTHETIC OIL IN MY ES 300 / 2002 / ALSO MY AUTO AVG MPG METER IS NOT READING RIGHT IT STAYS AROUND 20MPG & 18 MPG WHY IS THIS NOT FUNCTIONING PROPERLY IS THERE A WAY TO RESET