What is the shelf life for Exxon aviation piston engine oils?

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What is the shelf life for Exxon aviation piston engine oils?

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ExxonMobil: The shelf life for most of the oils is 5 years under normal storage conditions. The date of manufacture can be determined using the batch and fill codes printed on each bottle. The shelf life of Exxon Elite 20W-50 is 4 years.