The 2018 Malibu uses Dex-Cool orange long-life antifreeze, GM’s Dex-Cool HOAT coolant. It is typically available as a 50/50 premixed solution or as a concentrate that must be mixed with distilled water, and it should not be mixed with non-Dex-Cool or non-HOAT formulations.
To help you understand the Malibu’s cooling system requirements, below are the key points about what to buy, how to mix or refill, and where to source the correct coolant.
Recommended coolant types and compatibility
Important details about the Malibu’s coolant and what to look for when purchasing or upgrading your antifreeze.
- Dex-Cool orange long-life antifreeze (HOAT), specifically GM Dex-Cool or an OEM-approved Dex-Cool product.
- Available as either premixed 50/50 coolant or as concentrate; if concentrated, it must be diluted with distilled water to achieve a 50/50 mix.
- Do not mix Dex-Cool with green, blue, or universal/coolant blends that are not Dex-Cool/HOAT-compatible, as mixing can reduce protection and cause chemical reactions.
- Labeling should clearly indicate Dex-Cool (orange) and, ideally, GM-approved Dex-Cool or Dex-Cool HOAT compatibility.
- Dex-Cool is designed for longer service intervals (roughly around 5 years or 150,000 miles under typical conditions), but always follow your vehicle’s manual for the recommended service schedule.
Choosing the right Dex-Cool and avoiding incompatible coolants helps protect the cooling system and prevent sludge or seal damage over time.
How to add or replace coolant
Follow these steps to safely refill or replace the Malibu’s coolant and ensure proper system operation.
- Make sure the engine is completely cool before opening the radiator cap or reservoir to avoid scalding from pressurized coolant.
- Locate the coolant reservoir and check the current level on the marked full/min marks.
- Decide whether to use premixed Dex-Cool (50/50) or Dex-Cool concentrate. If using concentrate, mix with distilled water to achieve a 50/50 solution as stated on the product label.
- Pour the coolant into the reservoir to the appropriate full line, then replace the cap securely.
- Run the engine with the heater set to hot for several minutes to bleed air from the system, monitor for leaks, and recheck the level once the engine has cooled and the system pressurizes.
- Dispose of any old coolant properly at a recycling center or automotive shop and never pour it down the drain or onto the ground.
If you’re not comfortable performing a coolant change yourself, a certified technician can perform a 50/50 Dex-Cool refill and check for air pockets or leaks in the cooling system.
Buying options and what to look for
Where to source the correct Dex-Cool and how to verify compatibility before you buy.
- GM Original Equipment Dex-Cool or other Dex-Cool-branded products that specify compatibility with GM vehicles.
- Premixed Dex-Cool (50/50) or Dex-Cool concentrate labeled for GM/HOAT Dex-Cool usage.
- Avoid universal or green coolant blends that are not specifically Dex-Cool/HOAT compatible with GM engines.
- Check the label for the orange color and explicit Dex-Cool/GM compatibility to ensure it matches the Malibu’s requirements.
- Note the service interval guidance (approximately 5 years or 150,000 miles under typical conditions) and follow the owner’s manual for maintenance timelines.
When shopping, choosing a product labeled as Dex-Cool or GM-approved Dex-Cool helps ensure compatibility and optimal protection for your Malibu’s cooling system.
Summary
The 2018 Chevrolet Malibu relies on Dex-Cool orange long-life antifreeze (GM Dex-Cool/HOAT). Use either premixed 50/50 Dex-Cool or concentrate that you dilute with distilled water, and avoid mixing with non-Dex-Cool or universal coolants. Follow the vehicle’s manual for service intervals and consult a professional if you’re unsure about the refill or if you notice leaks or overheating. Proper sourcing and correct mixing are key to maintaining the Malibu’s cooling system health.