Perhaps the most important thing you can do is to change the oil, even more frequently than the manufacturer’s recommendation, and use a high-quality synthetic motor oil. After that, no rabbit starts or jump starts, no unnecessary high-revving, no unnecessary hard stops, treat the accelerator as if there is an egg under it. You needn’t worry about using the engine as a brake while going down a hill. It’s harder on the clutch to engage and disengage it like that all the time.