Synthetic does not cause leaks. PERIOD.
For a leak to start after the change, the problem had to exist allready. In other words, you had big problems in the VERY near future.
Synthetic beats regular oil in every way. Will not go into the power or fuel mileage debate here, or even value for money, but it IS better oil.
Synthetic blend is basically just snake oil. Either use dino oil or synthetic.
Erik
