I wouldn't be so quick to switch to synthetics. Synthetic oils carry a detergent factor to them that tends to clean out all the "crud" around seals which will cause them to leak. So, if you want to run synthetic be prepared to change all the associated seals (engine or trans).
Just because you never noticed a difference in your fuel economy doesn't mean that synthetics don't work. I tracked my mileage very accurately, driving the same route everyday, from home to school, and averaged 38-40 mpg. When I changed to Amsoil gear oil my next tank went up to 42 mpg.
Quote from: "vwmike"I wouldn't be so quick to switch to synthetics. Synthetic oils carry a detergent factor to them that tends to clean out all the "crud" around seals which will cause them to leak. So, if you want to run synthetic be prepared to change all the associated seals (engine or trans).Although early formulations of syntheitcs may have caused this, it is no longer true (and hasn't been for a long time)...