[TheMAN]

the time based intervals are ASSuming that you drive lots of short distances.... the engine doesn't get hot enough to burn off water condensates in the oil, and also because the engine fails to get hot enough, fuel dilutes the oil which compromises its operating life

now if you're like me who drives their car for a good distance (16km or more) but seldomly, then you can throw this rule out the window and just change the oil based on mileage


those intervals were mere guidelines and recommendations for the general populace... if you're educated and smart about cars, then you can ignore them and safely make your own determinations