The 2015 Chevy Malibu should use Dex-Cool Extended Life Engine Coolant (orange), typically in a 50/50 premixed solution or as concentrate to mix with distilled water. Avoid green or universal coolants unless the product explicitly states GM Dex-Cool compatibility.
Why Dex-Cool is the recommended choice for this model
Many GM vehicles from this era rely on Dex-Cool Extended Life coolant, a phosphate-free HOAT formulation designed for longer service intervals. Using a coolant not specified by GM can lead to deposits, corrosion, and cooling-system problems. For the Malibu, sticking to Dex-Cool or a GM-approved Dex-Cool-compatible product helps protect the radiator, water pump, and cooling passages.
Here is a quick guide to the options and how to apply them safely:
- Dex-Cool Extended-Life Engine Coolant (orange) that meets GM specification (GM Dex-Cool / HOAT).
- Coolants labeled as “Dex-Cool compatible” or “GM Dex-Cool approved” from reputable brands, ensuring the product clearly states compatibility with GM Dex-Cool.
- Premixed 50/50 Dex-Cool solution or concentrate that you dilute with distilled water to achieve a 50/50 mix, following the product instructions.
In summary, the Malibu’s cooling system is designed around Dex-Cool or an explicit Dex-Cool-compatible coolant, with a target 50/50 mixture unless a premixed variant is provided by the manufacturer.
Practical steps for topping off or replacing coolant
When topping off or performing a coolant change, follow these steps to maintain the system’s integrity and avoid damage:
- Ensure the engine is completely cool before opening any cap on the cooling system.
- Locate the coolant reservoir and check the level against the MAX/MIN marks.
- If low, add Dex-Cool either as premixed 50/50 or as concentrate diluted with distilled water to achieve a 50/50 mixture.
- Avoid mixing Dex-Cool with green or universal coolants unless the product explicitly states compatibility with GM Dex-Cool.
- If you suspect the current coolant is not Dex-Cool (for example, if you’re not sure what was added last), consider a full cooling-system flush and refill with Dex-Cool to prevent cross-contamination.
After topping off, run the engine with the radiator cap off for a short period to bleed air, then recheck the level and reseal the cap.
What to do if your Malibu currently uses a different coolant
If the vehicle has an unknown or non-Dex-Cool coolant in the system, plan a full flush and refill with Dex-Cool or a GM-approved Dex-Cool-compatible product. Mixing unknown coolants can cause chemical reactions, gel formation, or mineral deposits that compromise cooling efficiency.
Maintenance and service intervals
GM generally recommends changing Dex-Cool approximately every 5 years or 150,000 miles, though actual intervals can vary based on driving conditions and service history. Always reference the owner’s manual or consult a GM dealer for the precise interval for your vehicle’s engine and cooling system.
Summary
The 2015 Chevy Malibu relies on Dex-Cool Extended Life Engine Coolant (orange), typically used in a 50/50 mix. Choose GM Dex-Cool or a Dex-Cool-compatible HOAT coolant from a reputable brand, and avoid green or universal formulas unless explicitly labeled as Dex-Cool-compatible. Follow proper topping-off procedures, and consider a full system flush if the current coolant type is uncertain. Regularly check levels and follow GM’s service intervals for optimal cooling-system health.