Quote:
Originally Posted by DooDooBrown
Miles. I think the whole thing about every 3 months is a sham..... Does anyone really know how long the oil was sitting in the container prior to you purchasing it, and dumping it into your engine? Oil doesn't just break down because it sits around (if it does, it is going to be so little that you will never see a difference). You already said that you drive it easy, so if it looks in good condition, just go with the miles, and don't worry about the months.
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The oil doesn't break down it gets moisture in it. Take a jar and some oil and water and shake it up. Emulsified oil doesn't lubricate well. I think the basic point here is if you drive 2000 miles a year you still need to change your oil at least once a year but most would recomend twice.
It all depends on the conditions but the worst is on cool days and short trips where the temperature doesn't get hot enough to drive the moisture out. If its sitting in a garage out of the elements its going to have less moisture than if its taken to the grocery store to pick up some milk (unless the grocery store is in the next city). Condensation is also going to be a problem in those same conditions.