A complete guide to choosing and replacing antifreeze on a 2018 Nissan Terrano

Crossover owners Nissan Terrano 2018 models often face the need to service the engine cooling system. This task seems simple only at first glance, since an illiterate choice of fluid can lead to serious consequences for the power unit. Series engines H4M, installed on this model, have specific requirements for the chemical composition of the refrigerant.

Ignoring factory specifications can cause radiator corrosion, deterioration of rubber seals, and the formation of sludge that clogs engine block passages. To avoid costly repairs, you need to understand the difference between types of antifreeze and know the exact parameters of the original fluid.

In this article, we will analyze in detail which product is required for your car, how to correctly calculate the volume and how to carry out the replacement procedure yourself without the risk of damaging the system.

Original manufacturer specifications and approvals

Manufacturing plant Nissan does not use universal mixtures in its engines. For the 2018 model equipped with a 1.6 or 2.0 liter gasoline engine, it is critical to use a fluid that meets the standard Nissan Long Life Antifreeze/Coolant. This is not just a marketing name, but strict technical regulations.

The original antifreeze has a bright green color (sometimes with a bluish tint) and belongs to the class HOAT (Hybrid Organic Acid Technology). It contains inorganic corrosion inhibitors and organic acids, which provides long-term protection for aluminum engine parts. Mixing with other types, such as red G12 or yellow G11, is strictly prohibited.

If you see the inscription “Universal” on the canister without indicating approval Nissan, it's better not to take risks. Using non-certified mixtures will cause the additives to react and precipitate. Mixing green Nissan antifreeze with red G12 instantly causes the fluid to coagulate and form gel-like clumps that can completely block the thermostat.

⚠️ Attention: Never add water to the system if the level has dropped below the minimum. This will upset the chemical balance and lower the freezing point. Use only distilled water as a last resort, but with subsequent complete replacement.

Compatibility of analogues and choice of manufacturer

It is not always possible to buy an original canister Nissan under the article 999EG-40L00. In such situations, it is necessary to look for high-quality analogues that have the appropriate approval. It is important to check not the color, but the specification on the label.

There are proven brands on the market whose products meet the requirements JIS K 2234 and Nissan EL500-02. Such manufacturers include Koolant, Totachi and Valvoline. When choosing, look for packaging that clearly states the HOAT or G48 grade (although G48 is more often associated with VW, some formulas are compatible with approval).

• 🔹 Totachi Coolant Green - Japanese brand, often delivered to the assembly line, fully compatible with motors H4M.
• 🔹 Koolant Niss — specialized fluid developed taking into account the specifics of engines Renault-Nissan.
• 🔹 Valvoline Premium Blue - a quality product, but requires careful checking of the tolerance on the back label.

If you decide to save money and buy a cheap Chinese equivalent without certificates, you risk getting a liquid that will turn into an abrasive paste within a year. Cheap additives quickly burn out, leaving the metal without protection from electrochemical corrosion.

Always check the date of manufacture. Antifreeze has a shelf life, usually about 3-5 years in unopened containers. Expired fluid loses its protective properties even before it enters the engine.

Volume calculation and replacement intervals

To carry out the work correctly, it is necessary to know the exact volume of the cooling system. For Nissan Terrano 2018 with 1.6L engine (H4M) total capacity is approx. 6.6 liters. When replacing with flushing, it may take a little more, since the old fluid does not drain out completely.

If you are planning a partial replacement (topping up or replacing only when replacing pipes), it is enough to buy 4 liters. However, for a complete fluid change, it is better to purchase two 4-liter canisters or one large 10-liter canister, if one is available for sale.

Factory regulations require the first replacement after 90,000 km or 5 years of operation (whichever comes first). Subsequent replacements should be carried out every 45,000 km or 2.5 years. This is due to the fact that in Russian road conditions the load on the cooling system is much higher than in laboratory conditions.

Step-by-step instructions for replacing coolant

The replacement procedure requires care and compliance with safety precautions. Work should only be carried out when the engine is cool, as hot liquid under pressure can cause serious burns. Open the hood and locate the expansion tank and radiator drain plug.

First you need to drain the old fluid. To do this, place a wide container under the radiator and carefully unscrew the drain plug (usually plastic). After this, open the cap of the expansion tank to speed up the draining process due to the flow of air. Do not forget to check the presence of a drain plug on the cylinder block, if provided for by the design.

After draining completely, screw the plug back and fill in new fluid through the neck of the expansion tank. Fill slowly to avoid air pockets. Fill the system to the mark MAX on the body of the tank.

Start the engine and let it idle until the cooling fan turns on. At this moment, monitor the level in the tank - it may drop as the system fills and air comes out of it. If necessary, add fluid to normal level.

⚠️ Attention: If after replacement you notice that the engine temperature is rising faster than usual, stop immediately. This is a sign of an air lock that needs to be removed by lifting the front of the car or cranking the engine with the cover open.

How to properly remove an air lock?

Start the engine, open the reservoir cap, and gently press the upper radiator hose to bleed air. Repeat until bubbles appear.

Diagnosis of problems and signs of poor quality fluid

You can understand that antifreeze requires replacement not only by mileage, but also by appearance. Take some fluid from the expansion tank and inspect it in the light. If you see rust, an oil film or flakes, this is a signal for immediate replacement.

The factory green color may fade over time, but it should not turn brown or black. A color change indicates the destruction of corrosion inhibitors and the beginning of active oxidation of the metal within the system.

• 🔸 Oil emulsion - a sign of gas breakthrough or a faulty cylinder head gasket, requiring urgent repairs.
• 🔸 Viscous consistency - indicates that the additives have curdled and the liquid has lost its properties.
• 🔸 Unpleasant smell - may indicate overheating and glycol decomposition.

It is also worth paying attention to the level. If it drops faster than once every six months, you need to look for a leak. This often occurs through microcracks in the pipes or a leaky interior heater radiator.

Frequent errors during system maintenance

Many owners make the mistake of trying to mix the remains of old antifreeze with new one. Even if you use the same brand of fluid, the chemical composition of the old mixture has already been changed by wear products. This reduces the protection effectiveness of the new antifreeze.

Another common mistake is using tap water. Tap water contains salts and chlorine, which instantly cause corrosion of aluminum radiators and cylinder blocks. This is especially critical for engines with thin cooling duct walls.

Don't forget to check the condition of the expansion tank cap. It contains a pressure valve that maintains the correct pressure in the system. If the valve is stuck, this can lead to ruptured pipes or overheating of the engine.

Sometimes owners try to “strengthen” the cooling system by adding special sealing additives. You should not do this unless absolutely necessary, as these substances can clog the thin channels of the heater radiator, which will lead to a lack of heat in the cabin in winter.

Parameter	Value for Nissan Terrano 2018
Antifreeze type	HOAT (Green)
System volume (1.6L)	6.6 liters
First replacement	90,000 km / 5 years
Re-replacement	45,000 km / 2.5 years
Freezing point	-40°C (standard)

What color should original Nissan antifreeze be?

The original liquid has a bright green color, sometimes with a slight bluish tint. Other colors (red, blue, yellow) indicate third-party brands or analogues that may not be suitable in chemical composition.

Is it possible to add water to antifreeze in winter?

Strongly not recommended. Adding water lowers the freezing point of the mixture. In cold weather, this can lead to rupture of the radiator and cylinder block due to ice expansion. You can only add the same antifreeze or distilled water in extreme cases, followed by a complete replacement.

How long does it take to completely replace antifreeze?

If you have the tools and skills, the procedure takes from 45 minutes to 1 hour. This includes draining the old fluid, flushing (optional), adding new fluid, and removing any air pockets as the engine warms up.

What happens if you mix up the colors of antifreeze?

Mixing incompatible types (such as green HOAT and red carboxylate) will result in a chemical reaction. The fluid can coagulate, precipitate, and clog the cooling system passages, requiring an expensive radiator flush or replacement.

Is it necessary to change antifreeze if the car is in the garage and not driven?

Yes, the replacement interval is tied not only to mileage, but also to time. Chemical additives lose their properties over time, even in a closed system. If the car is more than 5 years old from the date of the last change, the fluid should be updated regardless of mileage.