Updated at: 18-03-2022 - By: micdot

In every car, there is a coolant that is used in the cooling system. Ethylene glycol, or EG, is the primary ingredient in most coolant brands. Propylene glycol, or PG, is used by various brands. What’s the difference between the 70/30 coolant and the 50/50 coolant? At a ratio of 70/30, it is more likely that the antifreeze or water will boil above the recommended temperature of 212 degrees Fahrenheit. After mixing 70/30 coolant and water together, the temperature drops to -67 degrees Fahrenheit and rises to 235 degrees Fahrenheit; a 70/30 mixture is less efficient at transmitting heat than a 50/50 mixture.

This is due to the fact that ingesting it is less harmful. Antifreeze is a coolant solution made by mixing antifreeze and water in an equal ratio. It protects against freezing and boiling over better than pure water. Water is an excellent heat conductor. When used to cool an engine and transfer heat to a radiator or heater core, it performs admirably. Pure water, on the other hand, freezes at 32 degrees Fahrenheit and boils at 212 degrees Fahrenheit, making it ineffective for year-round driving or a hot engine. 70/30 or 50/50 coolant has been a common question among car owners. The subject of this post will be discussed in greater detail here. Let’s get this party started.

What Is The Difference Between 70/30 And 50/50 Coolant?

Antifreeze may lower the freezing point to a negative 35 degrees Fahrenheit if mixed with equal proportions water (50/50). As a result, the boiling point will rise to 233 degrees Fahrenheit. Protect the engine and cooling system by using corrosion inhibitors in your antifreeze. In the most long-life coolant, the additive package can last five years and 150 miles. In order to reduce the frequency of coolant replacement, coolant life can be extended. For the vast majority of applications, a 50/50 blend of coolant and water is recommended.

For the majority of applications, it offers the best all-around cooling protection and performance. Premixed antifreeze is a 50/50 mixture that saves the user the time and effort of having to mix the water and antifreeze themselves properly. Antifreeze concentrations rose by as much as seventy percent in some cases. As a result, a 70/30 mix will lower the freezing point of the mixture to -67°F, and raise the boiling point of the mixture to 235°F. It is less effective to use a 70/30 mixture of coolant and water to transfer heat than a 50/50 ratio.

It’s because antifreeze has a lower heat capacity than water. If the radiator’s cooling capacity is inadequate, this might cause the engine to run hot and overheat.

Which Coolant Is Better, 70/30 Or 50/50?

70/30 coolant/anti-freeze mix is the optimal ratio for raising the boiling point. The freezing point will also be lowered. On the back of most containers, it’s printed as a table. At a ratio of 70/30, it is more likely that the antifreeze or water will boil above the recommended temperature of 212 degrees Fahrenheit. Physical features mean it will also freeze at temperatures lower than the standard 32 degrees Fahrenheit. The boiling point will begin to drop if your solution concentration rises above 70%. The freezing point will start to rise as well, thanks to the qualities of purer ethylene glycol. Using a 50/50 to 70/30 ratio is ideal, and the 70/30 is the best and most ideal.

When Should You Use 50/50 Antifreeze?

If you buy antifreeze, you’ll have to mix it with water and get a little more involved in the process. However, you’ll have more leeway when it comes to concocting the concoction with it. An antifreeze/water mixture of 50% is an excellent starting point. However, when discussing the weather, it is important to take temperature into account. It’s ideal to use your 50/50 in temperate settings where the temperature drops below 32 on occasion. It is better to keep coolant from freezing if the mixture is closer to 70% coolant and 30% water in cold areas where temperatures will drop below 32 degrees Fahrenheit for an extended period of time.

When Should You Use 70/30 Antifreeze?

In other words, you should use a 70/30 mixture of ethylene glycol coolant and water. Seventy percent coolant and thirty percent water are contained in the mixture. If you live somewhere where winters are very harsh, this is the route you should take.


As a result, coolant is critical to the vehicle’s overall health. But a lot of people don’t know what to do with the mixture. As a result, the coolant mixture must be crystal clear. Use this as a guide to help you along the way.