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30 October 2025 (updated) Does engine oil expire if opened or left unopened?
Wondering if engine oil goes bad once opened or even if left unopened? This blog explores the shelf life of different types of engine oil, as well as how air, temperature, and storage conditions affect its quality. Keep your engine running smoothly by ensuring your oil still works!
Does engine oil have a use by date?
Yes, engine oil typically has a "use by" or expiry date, though it's not always explicitly labelled on the packaging. Most manufacturers recommend using it within 2 to 5 years of production, depending on the type of lubricant.
Over time, it can degrade due to oxidation, exposure to moisture and light, and certain chemical reactions, reducing its effectiveness in protecting your engine. Always check the packaging or consult the manufacturer for specific guidelines. It’s important to note that the expiry date or shelf life of unused oil is not the same as the recommended change interval for used oil.
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How long does unused engine oil last?
This depends on the manufacturer, type of oil, storage conditions, and whether the bottle has been opened or not. When stored properly and sealed in a container, most lubricants will last between 2 and 5 years while some fully synthetic oils can last up to 7 to 8 years.
-23%
Article number: 5011987001831
compared to
RRP
£22.73
£17.49
£17.49
for 1 litre
price incl. 20% VAT, excl. delivery costs
VAG Engine oil
0W-30, 1l
Article number: GS55545M2
£13.99
£13.99
for 1 litre
price incl. 20% VAT, excl. delivery costs
-12%
Article number: 83212365929
compared to
RRP
£20.67
£17.99
£17.99
for 1 litre
price incl. 20% VAT, excl. delivery costs
-43%
Article number: 104039
More
compared to
RRP
£103.26
£57.99
£14.50
for 1 litre
price incl. 20% VAT, excl. delivery costs
Article number: 08880-80845
£63.99
£12.80
for 1 litre
price incl. 20% VAT, excl. delivery costs
Always check for the manufacturer’s recommendation and avoid using oil past its expiration date, as its performance may degrade over time. Make sure to keep the product in a cool dry place away from direct sunlight and out of the reach of children.
Find out more in the table below:
| Type of Oil | Shelf Life (sealed) | Shelf Life (opened) | Storage Recommendations |
|---|---|---|---|
| Mineral Oils | |||
| Standard Mineral Oil | 3–5 years | 1 year | Store in a dry, cool place, away from direct sunlight and moisture. |
| Mineral Oil with Additives | 3–4 years | 1 year | Additives may lose effectiveness over time; avoid contact with air. |
| Mineral Oil for Diesel Engines | 2–3 years | 1 year | Sensitive to temperature fluctuations, avoid contact with moisture. |
| Mineral Oil for Motorcycles | 3–4 years | 1 year | Avoid exposure to sunlight and extreme temperatures. |
| Semi-Synthetic Oils | |||
| Standard Semi-Synthetic Oil | 5 years | 1–2 years | Store in a cool, dry place, avoid exposure to direct sunlight. |
| Semi-Synthetic Oil with Additives | 4–5 years | 1–2 years | Additives may lose their effectiveness, avoid contact with air. |
| Semi-Synthetic Oil for Diesel Engines | 3–4 years | 1–2 years | Sensitive to temperature fluctuations, avoid moisture and sudden temperature changes. |
| Semi-Synthetic Oil for Motorcycles | 4–5 years | 1–2 years | Avoid exposure to direct sunlight and temperature fluctuations. |
| Semi-Synthetic Oil for Heavy-Duty Engines | 4–5 years | 1–2 years | Requires storage in areas protected from moisture and extreme temperature changes. |
| Synthetic Oils | |||
| Fully Synthetic Oil | 5–7 years | 1–2 years | Store in a cool, dry place, away from direct sunlight. |
| Synthetic Oil with Additives | 5–6 years | 1–2 years | Check the manufacturer’s instructions before use as some products require shaking after long sitting periods. |
| Synthetic Oil for Diesel Engines | 4–5 years | 1–2 years | Avoid exposure to moisture and extreme temperature fluctuations. |
| Synthetic Oil for High-Performance Engines | 5–7 years | 1 year | Specialised oils may have specific storage requirements. |
| Synthetic Oil for Motorcycles | 4–6 years | 1–2 years | Motorcycle oils are prone to oxidation; avoid exposure to air and light. |
Can you use expired engine oil?
This is strongly advised against as expired oil does not have the required lubrication properties to keep your engine protected and corrosion-free. It will degrade much faster and the viscosity may be negatively affected. When it comes to something as critical as engine oil, it’s better not to take chances.
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Does engine oil go bad if the car is not used?
The simple answer is yes, it can still degrade even if you don’t drive the car. Over time, it can break down due to oxidation, moisture absorption, and temperature fluctuations, especially in cars that sit idle for long periods. Contaminants may also build up. It’s generally a good idea to fill up with new engine oil about once a year, even if the vehicle is just sitting there.
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