
Originally Posted by
oj88
If you drive around in traffic a lot like we do here in Metro Manila, the time the engine is running at idle RPM becomes a factor. Leaving the engine at idle RPM for a significant amount of time has detrimental effects on oil life and by extension, added engine wear.
That's why it is not the best practice to just rely on traveled distance to decide on when to change the oil. The actual engine run-time is actually the reason why car manufacturers specify a "whichever comes first" clause.