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What is the shelf life of fully synthetic engine oil?

1 Answers

EmmanuelAnn

07/29/25 11:24pm

National regulations clearly stipulate that the shelf life of engine oil under sealed conditions is generally within 5 years, and fully synthetic engine oil also falls within this range. However, opened engine oil deteriorates faster and should ideally be used within one year. Expired engine oil should not be used as its chemical composition may have changed, which could adversely affect the engine. Methods to determine if fully synthetic engine oil has deteriorated are as follows: 1. Fully synthetic engine oil should be a clear, semi-transparent, or transparent liquid. If the oil is oxidized, its color may change. Additionally, if the oil's transparency decreases, it indicates deterioration. 2. If the oil has a sour or foul odor, it has deteriorated. If you observe significant changes in the oil's viscosity (thinning or thickening) and uneven consistency, it should no longer be used.

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