[TheMAN]

oh yeah, I want to add that the climate matters a lot if you're driving short distances and have to determine a TIME BASED oil change interval

a hot climate obviously allows an engine to get up to operating temperatures faster and also reduces the possibility of water condensation in the oil due to the great dew point versus ambient temperature difference

so in other words, short distance driving in summer doesn't necessarily reduces oil life while short distance driving in winter does since 1) engine takes longer to warm up 2) higher water condensation possibilities