What is the best oil and fuel recommended for the FG XR6T, there are so many types out there, I have tried only the V-power from shell and it seems very thirsty at present, I haven't tried BP Ultimate or Caltex Vortex yet. in 98 octane. I haven't tried any of the 95 octane yet.I would like to see which gives the best mileage, the performance is second at this stage, as the car has plenty of guts anyways. I haven't changed the oil yet however Castrol Magnetic was highly recommended, Mobil ! 0W 40 is a bit too expensive. Any help or assistance would be appreciated.