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Originally Posted by d18mike
For what its worth, I put about 4-5K a year on my car and store it for 5 months. I change it once a year (Mobil 1). My mechanic jokes that he could rebottle and sell to the next customer. It's pretty clean at that point. I just do it every spring for piece of mind.
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sadly, your motor oil, even when unused, losses it's lubricating properties over time. Over the course of a year, humidity, temperature changes, and yes, even ground level ozone can alter the chemical makeup of you oil.
I've heard 3 months as the rule, but 6 doesn't seem all that bad. 1 year? to each his own, but at 13k to replace a motor, if you're going to gamble, play it on the safe side.
just my .02