Finally finished with the Auto RX in the BMW. Gas mileage went up 1 mpg. Changed oil and started with GC 0W/30. Very green colour, looks nice. Took the car for Emissions inspection and passed without any problems. Now what do I do when I buy some more Is the 05 GC the same? I will have some time because I expect to keep the oil for 10k. Will see how it does.