sure... i did ask them for 10w40 but they didn't have it and they were like we will not recommend that oil etc etc..,,, will try at some other authorized dealer next time. btw does changing to 10w40 will make any significant change on the overall performance of the engine.
i am not that much concerned on the mileage as i get an avg of min 16 to max 16.3 and i think for an AGS variant its good enough...