I run Amsoil oil. Recommended drain interval 24k miles or about 38k kilometres. I have 110k miles and still get excellent mileage, and great HP according to dyno.

I run it 20k, 4 filter changes.

Sold 1998 Contour LX 13.868 sec 1/4 mile time. Two years of rental cars, seriously. Holding out for 07 Cobra Mustang.