How Long To Let Engine Cool Before Adding Oil?

Adding oil to your car is an essential part of routine maintenance, but it’s important that you wait properly for your engine to cool before doing so. Overheating and hot motors can cause significant damage and even fires if not handled correctly. In order to keep yourself safe, as well as protect the longevity of your vehicle’s motor, get informed on how long to let engine cool before adding oil.

Read this comprehensive guide to learn all about the potential dangers, suggested waiting times, and other valuable details surrounding automotive oil changes!

Can I Add Engine Oil When Engine Is Hot?

If you’re wondering whether or not you can add engine oil to your car when the engine is hot, the answer is yes, you can. However, it’s important to proceed with caution. You should wait at least 20 minutes after turning your car off to allow the oil time to drain back into the sump. This will not only ensure that you get an accurate reading but will also help prevent you from getting burned.

What happens if you add oil while the engine is still hot?

When oil is added to a hot engine, it can cause the oil to thin out and become less effective. Additionally, if your engine is already very hot, adding more oil can cause the motor to overheat further. This could lead to significant damage and even fires, so it’s always best practice to let your engine cool before adding more oil.

What is the ideal temperature to add oil?

How Long To Let Engine Cool Before Adding Oil (1)
How Long To Let Engine Cool Before Adding Oil (1)

Quality conventional motor oils can withstand temperatures up to 250 degrees in the oil sump, but anything beyond 275 degrees can begin to break down the oil. With this in mind, experts recommend keeping temperatures between 230 and 260 degrees, providing the ideal range for optimal oil performance.


FAQs about How Long To Let Engine Cool Before Adding Oil

Is it better to add oil to a hot or cold engine?

While it may seem counterintuitive, most oil experts recommend changing oil while it’s still hot. This is because hot oil flows more freely and is easier to drain from the engine.

Are there any other precautions I should take when adding oil?

When changing or adding oil, always make sure that you are wearing protective gear like goggles and gloves in case of spills or splashes. Additionally, it’s important to check your oil filter to ensure that it is clean and in good condition before adding new oil.

Related: How To Check Your Oil

Can you add cold engine oil to hot oil?

Yes, cold oil can be added to hot oil in your engine, but it’s not recommended.

Can you put new oil on top of old oil?

While this may seem like a simple solution, it’s important to understand the potential risks involved. Mixing new and old oil can lead to contamination or the buildup of impurities in your engine.


Taking care of your car’s engine is essential for safe driving, as well as avoiding costly repairs. Remember to always let your engine cool before adding more oil and to use protective gear when changing it out. With this information in mind, you’ll be equipped with knowledge on how long to let engine cool before adding oil!

We hope this guide has been helpful in giving you a better understanding of best practices for automotive maintenance. In addition to knowing how long to let engine cool before adding oil, remember to check all fluids regularly and get regular tune-ups. Doing so will help keep your car running smoothly for many miles down the road!

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