Motor oil degrades over time, with changes in color and texture as indicators. ExxonMobil recommends a 5-year shelf life for unopened engine oils. However, opened oil has a shorter lifespan due to temperature, humidity, and dusty environments. Recognizing the signs of degradation and knowing when to replace oil is essential for efficient vehicle operation.
Does Motor Oil Expire?
Yes, motor oil does expire. Over time, it loses its viscosity, making it less effective at lubricating moving parts. Contamination can also occur if oil is left in an engine for too long or stored improperly. Modern production techniques, which include the use of additives, can help extend oil’s lifespan by stabilizing its chemical bonds. Nevertheless, the effectiveness of oil fades after a few years even with optimal storage conditions.
Guidelines for Storage and Usage
- Unopened engine oil: Use within 5 years.
- Opened engine oil: Use within 1 year.
- Gear and transmission oil: Follow the same one-year rule after opening.
- Proper storage: To extend lifespan, store in conditions without extreme temperature fluctuations.
Despite these guidelines, chemical compounds in the oil can still break down over time, making the oil less efficient. It’s crucial to pay attention to expiration dates, store oil properly, and change degraded oil immediately for the best engine performance.