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If your car has just been sitting there parked, and barely run or driven at all, then the oil has not deteriorated. (Oil in the can does not have a shelf life.)
On the other hand, if you have been sitting hour after hour in stop and go traffic, putting lots of engine running time on the engine and little miles on your car, then your oil has been in use and has accumulated contaminants, and should be changed.

So if you drive normally without lots of stop & go traffic, go by the mileage. If you have a daily commute with lots of sitting in traffic and not many miles, go by the calender.

tb2
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