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Best RV antifreeze

Last Updated: 01.12.22


What is the best RV antifreeze in 2022?


If you’re looking for the best RV antifreeze and you’re not particularly knowledgeable in this field, then you should seek all the professional advice you need. Luckily for you, instead of wasting your time reading countless RV antifreeze reviews, you can take the shorter alternative and browse through our well-researched guide. Our findings show that the first product to take into consideration is the Zerex Original Zx001, due to its various advantages. First of all, its concentrated formula results in increased efficiency. It comes in one-gallon jugs, so it will last for a long time until you have to repurchase it. This engine coolant is compatible with all kinds of terrain vehicles, including motorcycles, scooters, snowmobiles, so it’s not just for your RV. Should this alternative be unavailable, we suggest you check out the Valvoline Zerex G-05 instead, as it would make for an excellent second choice.


Comparison Table


The Good
The Bad



A short buying guide


In helping you find the best antifreeze for RVs, we’ve prepared a comprehensive guide filled with useful suggestions on how to choose the item that best suits your needs and the technical requirements of your vehicle.





As you probably already know, it’s essential that the product you end up buying does not contain any phosphates. Not only is it the norm, but it damages the metallic parts of the engine, causing rust in time.

Aside from that, you’re free to choose the chemical composition of the liquid as you please, but make sure it’s biodegradable in order not to harm the environment.

One more thing to consider would be the concentration, which you should choose according to the type of engine that your vehicle has, be it diesel or gasoline.

Most of the coolants available on the market are compatible with more than one type of vehicle, so if you’re buying it for an RV but plan to use it for other automobiles you might own, make sure the formula is compatible to avoid an unpleasant situation.

One more thing you should know is that the shelf life of such a product is long enough that you won’t have to worry about the expiry date. Just get the amount that has the best price and use it without worrying about this issue.


Concentration and dilution


There are two alternatives concerning coolant liquids. The ones that come already prepared and the ones that come in half-empty containers that you need to combine with water before using them.

The perk of the latter would be that they keep the scent fresh until they are used, while the first alternative is a fast solution that you can use straight out of the bottle.

The concentration of the liquid also affects its protective capabilities. Let’s not forget this is, after all, a bottle of antifreeze, so it’s essential to pay attention to the temperatures specified by the manufacturer.

Most alternatives will offer you protection for temperatures down to -35 degrees Fahrenheit, maybe -50 if you find a stronger formula. Our advice would be to adjust it to your geographical area and the temperatures usually registered during the cold season.


Other aspects


Regarding the budget, it’s safe to assume that whenever you’re buying a more significant amount, the price will be more attractive. As we’ve discussed before, the antifreeze doesn’t have an expiry date, so if you find a product that comes in larger packaging, speculate the bargain and buy it without worrying about anything.

One more thing worth mentioning would be to check and see if it’s compatible with other vehicles you already own if you want to be efficient and limit your research to just one product.



Our top picks



In the following list, we’ve presented some of our favorite products, the reviews detailing some of the critical aspects of what you should look for in a good RV antifreeze. Since it can be difficult to browse through the various options available for sale, we recommend you begin your search here.



Zerex Original ZX001 


Main advantage


The most relevant feature that this alternative has to offer is the protection it provides for the metallic components of the engine. Its formula is enriched with a corrosion inhibitor that prevents the metal from developing rust and thus manages to prolong the life expectancy of the vehicle.

Another damaging effect that this coolant can prevent is corrosion, which can also be a great enemy to the normal functioning of a car engine. The substance contains all the necessary ingredients to make sure these problems do not affect your RV, ensuring long-term use.


Main disadvantage


This option is only compatible with vehicles for which the manufacturers specify that a green coolant is needed. Otherwise, regardless of the beneficial effects that it might have for the engine in normal conditions, you cannot use this liquid, mostly because it’s difficult to wash out the coolant previously used.

Mixing different compositions is ill-advised, and it can cause irreparable damage to your vehicle’s engine. However, it’s worth mentioning that this is an issue you will encounter regardless of the coolant that you choose to use, so it’s hardly a disadvantage, just a fact that needs to be considered.

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Top 3 features explained



This formula achieves its purpose by offering protection against temperature excesses for the engine of your RV. It can prevent freeze-ups when you’re driving in freezing temperatures during the winter months, as well as boil-overs when the car is exposed to high temperatures and excessive heat.

Aside from protection against these natural factors, which is the primary purpose of a reliable coolant, you also benefit from the fact that this product is equipped to create an improved environment for your vehicle, protecting the metal used in construction against corrosion or rusting.




Like other similar products, this coolant has to be mixed with water to be used. Its recipe is based on a low-silicate concentration that works for heavy duty applications with use of SCA.

It’s essential to mention that, similarly to other green coolants, this item is based on an ethylene glycol recipe and it’s incredibly toxic, so it should under no circumstances be swallowed since it might have extremely damaging or even fatal effects.

Speaking about damaging effects, you should not mix this liquid with any of the residual antifreeze that might still be in your car’s engine, because when combined they will irreparably damage the metallic components of the engine.



Many customers prefer this product because it’s proven its reliability in time. Zerex is an old brand that users have grown accustomed to, and they’ve always come up with a high-quality product, even before the age when the chemical composition of coolants was put under the microscope.

The formula is cost-efficient because it’s delivered in a case of four bottles, which may seem excessive but in actuality, you don’t need to open them all at once, and the liquid doesn’t lose its chemical properties in time. Also, the antifreeze mix doesn’t come with an expiration date.


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Valvoline Zerex G-05 


Another formula from the Zerex series, this one is based on a phosphate-free recipe. It’s nitrite that contains liquid coolant, and aside from keeping your engine running, it will also protect the cylinder liners from cavitation if you have a diesel.

Other components such as hoses, plastics or finishes will not be harmed by this substance, because it contains a high-quality defoamer system to prevent such damage.

The formula is low in silicates and has a reduced pH. No phosphates are included, to keep the metal components from corroding. Even though it has more benefit for a diesel engine, this item can be used just as well with a regular gasoline one.

It’s compatible with a wide range of terrain vehicles, meaning you can buy it for your RV, but you can use it for many more, including motorcycles and marine crafts. The product comes in a one-gallon container.


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Camco Concentrate 


This 100% biodegradable coolant can be used for various vehicles, including RVs, boats, and other terrain automobiles. The formula is non-toxic, meaning it’s safe for pets and curious kids to be around it, although it’s not advisable.

The protection offered by this antifreeze is effective down to -50 degrees Fahrenheit, if the liquid is diluted correctly. It comes in a concentrated form, and the packaging includes two one-gallon bottles.

To be able to use it, you need to add water in the bottle that contains the concentrated liquid until it reaches full volume. The process is easy to perform, and there are no chances of getting it wrong since the only extra fluid you need to add is water.

The main advantage is that you can store this product for as long as you need to and it will retain its lasting scent. There’s no reason why you should use both the bottles simultaneously.


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