How Often Should Car Coolant Be Changed? The Most Standard Check & Replacement Guide 2025

How often should the coolant be changed? 10,000km or 30,000km? Instructions on how to self-check, standard water change procedure and reasons to choose Gartz M77 (OAT) coolant to protect the engine.

Don't Wait Until the Last Minute

Coolant acts as a "temperature regulator", helping the engine operate stably, without overheating, leading to seizure or blown gaskets. However, unlike gasoline or engine oil that must be changed regularly, coolant is often forgotten until the car... starts smoking.

So exactlyHow often should the car coolant be changed?And how to replace it properly? Let's find out in detail with expert Gartz in this article.

1. Car Coolant: How Often Should It Be Changed?

In Vietnam’s hot and humid climate and dusty traffic conditions, cooling systems are subjected to heavy loads. To ensure the best cooling performance and prevent premature rust, Gartz recommends the following replacement schedule:

Old Technology (IAT - Green/Blue):This type contains Silicate, corrosion inhibitors that are consumed very quickly. You should replace them periodically after each10.000 - 20.000 kmto avoid sediment clogging the radiator.

New Technology (OAT/LLC - Red/Pink/Orange):Uses more durable organic acid technology. However, for optimal protection of aluminum parts and water pump, you should replace after each20.000 - 30.000 km.

Note:Don't just look at the mileage. If you open the hood and find the reservoir is cloudy, greasy, or brick-brown (rusty), replace it immediately regardless of the mileage.

2. How to Check Coolant at Home (Takes Only 2 Minutes)

You should get into the habit of checking the coolant every time you wash your car or before long trips:

Step 1:Park your car on a level and level surface.wait for the engine to cool completely(Never open the radiator cap when the engine is hot because boiling water can splash out and cause serious burns).

Step 2:Find the extra water tank (clear plastic container containing colored solution).

Step 3:Observe the water level. The ideal water level should be between the two lines."FULL/MAX" and "LOW/MIN".

If below MIN line: Need to add more.

More importantlyCOLOR: Water must be clear, keeping its original color (Blue/Red/Pink). If the water is cloudy, it is a red alert sign.

3. Technical Standard Coolant Replacement Procedure

Although you can do it yourself at home, Gartz recommends going to a reputable garage to ensure the cleanest cleaning process. The basic process includes:

Drain old water:Open the drain valve at the bottom of the water tank to remove the old solution.

Flushing:This step is extremely important to remove all dirt that has accumulated over time in the pipes, preventing the new water from being contaminated again.

Add new water:Pour new coolant (preferably pre-mixed or properly mixed) into the radiator.

Air bubble discharge (E discharge):Start the engine to run the water pump, pushing out all air pockets in the system, ensuring water fills every corner of the engine.

4. Why should you choose Gartz M77 (G12+) Coolant?

Instead of taking a chance with cheap coolants, choose peace of mind withGartz M77 Premium OAT.

G12+ Technology (OAT):Silicate-free, non-sludge, protects the radiator and water pump for long-lasting durability.

Extremely heat resistant:High boiling point helps the car "speed" through traffic jams or steep passes without worrying about the temperature needle jumping to the red line.

Aluminum protection:Special formula compatible with and provides maximum protection for aluminum alloy parts on new generation vehicles.

Conclude

"Prevention is better than cure". Don't spare the small expense of changing the coolant regularly, because the price to pay for "blowing the engine gasket" or "blowing" is very expensive. ChooseGartz M77to protect your car today!