Keeping your vehicle up-to-date and maintained is very important. People usually ignore checking the level of oils with the dipstick in their car, which can sometimes lead to serious problems. People frequently face issues with low engine oil but can’t figure out why. Some say this is due to leakage, while others say it is due to evaporation.

Does Engine Oil evaporate? Doubt this? Well, you don’t have to be doubtful about this anymore. Here in this article, we will tell you whether engine oil evaporates. Let’s have a look!

Does Engine Oil Evaporate?

Engine oil does not evaporate at room temperature like other fluids such as water, juice, etc. Even if you leave the engine oil on the floor for 48 hours, it won’t evaporate. But yes, engine oil does evaporate in cars! Let’s see why!

Why Does Engine Oil Evaporate In Cars?

The main reason behind engine oil getting evaporated is high temperature. We know that many liquids tend to convert into a gaseous state and evaporate when exposed to high temperatures or high heat. 

Also Read: How Engine Oil Cooler Works?

The phenomenon behind engine oil evaporating is the volatility rate. Before proceeding, let’s see what this volatility rate means and its significance in engine oil evaporation.

What Is Engine Oil Volatility Rate?

In the general sense, the volatility rate is the change in the oil price, but in the case of the engine, oil volatility is referred to as the speed or how rapidly the engine oil evaporates. The more the volatility of engine oil, the faster it will evaporate. 

Now that we have understood what volatility is let’s understand what makes engine oil evaporate.

Engine Oil Evaporates Due To High Temperature!

Heat is the main reason your engine repeatedly gets low on engine oil, and lubricants tend to evaporate when exposed to high temperatures. If you park your car at a place exposed to maximum heat, there might be a slight possibility that your vehicle’s engine oil will start evaporating in small quantities.

high temperature

Another way by which it can evaporate is engine oil getting burned. If your car’s engine is consuming too much oil, there might be a possibility it is burning oil. As we read above, engine oil evaporates at high temperatures, bringing oil to a burning temperature and evaporating.

What is important to understand here is engine oil does not evaporate completely. You might be wondering then, what does evaporate?

Lighter molecules in Engine Oil Evaporate!

Yes, the engine oil does not evaporate; the lighter molecules evaporate, leaving behind thick oil. Engine oils have lighter molecules converted to a gaseous state when exposed to high temperatures or heat, and these molecules then evaporate and make the oil thicker and more viscous.

The engine oil must maintain its viscosity for proper functioning and other associated parts. Let’s see what happens when engine oil evaporates!

Also Read: How To Get Water Out Of Engine Oil?

Effects of Engine Oil Evaporation

As engine oil evaporates, the base oil gets thicker, and the oil’s viscosity alters. The oil needs to lubricate the parts for the engine to work properly. 

As the engine oil evaporates, the thick base oil makes it difficult to work properly. A car engine requires high energy to lubricate parts as the oil thickens. Evaporation of engine oil means more oil consumption, and your engine oil tank will get low much more often. 

You will have to spend more money repeatedly refilling your car’s engine oil. And a frequent loss of engine oil can also cause serious damage to your car’s engine and the other associated parts as they won’t be lubricated. The car’s functioning will also get distorted, with engine oil evaporating too often.

It’s time to look at what one can do to prevent engine oil from evaporating.

How To Stop Engine Oil From Evaporating?

Broadly there are only two ways to stop engine oil from evaporating. One uses extra lubricants with low viscosity available in the market or switches to synthetic oil. Synthetic oils have low volatility compared to normal oils as they resist heat.

So it is always advised to switch to synthetic also that resist heat so that your car’s engine oil does not evaporate easily.


As mentioned above, engine oil does not evaporate at room temperature but evaporates in cars when heated. The engine starts burning the engine oil, and that’s when the engine oil starts evaporating.

If your car’s engine oil evaporates too often and you don’t notice any leakage, this is because of heat. You can either switch to synthetic engine oils or use extra lubricants available in the market.

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