I asked myself that question some time ago (since I buy oil the same way you do) and found an answer on the Mobil oil website. They say their oil is good for 10 years in an unopened bottle. I mentioned this to my friend who is an expert lubricant consultant for the Big Three and he scoffed, mentioning that it can probably last considerably longer.
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95 E320 Cabriolet, 159K
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