I am also a diligent driver of this kind of car, and my situation is similar to yours. For example, Mazda Artz, which started last year, used semi-synthetic engine oil at first, and kept going to the auto repair shop for maintenance and oil change. Last time nice, the repairman suggested to try synthetic engine oil, saying that the maintenance interval could be extended, and then I chose GT engine oil red. Up to now, the driving experience is still very good, and it has run 7000 kilometers, personally.