I own a 2011 Mazda 3 MPS (Mazdaspeed 3). Its always had Mazda service for the first 3 years and then I did it all myself. I have always used Gulf Competition 5w40 Ester Fully Synthetic oil. But at around £60 (using 5.7ltrs) Its a lot for a road car IMHO. I do a change every 6 months as the car...
