Quote:
Originally Posted by Dark Sarcasm
whichever comes first
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This.
If you do not drive your car long distances, letting it fully warm up (20 minutes per trip) then your oil eventually becomes heavily contaminated with water. This water comes from the intake, straight out of the air it is sucking in.
This is the reason for the time limit in addition to a mileage recommendation. If you drive few miles, but always drive for say an hour at a time then you're fine to extend the time, but otherwise I would just change it on the time mark or the mileage mark.