The only way to actually know is to get an analysis done. There are way too many variables to be able to peg a mileage or a time. A good synthetic can probably go longer than you think. For those of us too lazy, just pick a short-ish interval and you're fine. We short trip our cars a lot which is tough on the oil. I change it every 6 months which is usually about 5-6000km, and I'm sure plenty premature.
|