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The Aeroshell engineer give a greal good seminar on oils, the guys above are correct about getting out the oil with the acids in it. Shell actuall makes a pickling oil to preserve an engine at the end of the season. But what they may not know is that the oil needs to be changed probably very soon after the can/jug has been opened. He recommends that at 6 months whether its been ran or not it needs to be changed because the oil will absorb moisture and start to form acids again. This will cause corrision.

Most people dont know that oil also has a 4 year shelf life. This is due to the additives that are put into the oil begin falling out of suspension. They CANNOT be reinstalled by warming the oil up either. When they add the additives, they begin by heating the base oil and start adding each chemical at a specific temperature, at like somewhere near 350, they are finished. The use by date is marked on the case, not on each jug.

Just a little trivia. Tim

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Good points!

The shelf life of motor oil varies somewhat per manufacturer, but it's somewhere between 3-to-5 years given the oil is properly stored. For example: Store lubricants in a cool, clean, and dry indoor area with an ideal storage temperature of between 45ºF and 80ºF.

Also good notes on how additives are properly blended into the oil by the manufacture. This is why it's not a good idea to dump aftermarket motor oil additives into your crankcase and why no auto manufacturer condones the use of aftermarket motor oil additives.