2018 Chevrolet Malibu: Transmission Fluid & Service

Quick Answer

• Transmission Make/Model: General Motors 9T50 9-speed automatic (2.0L Turbo engine) or VT40/MGR Continuously Variable Transmission (CVT) (1.5L Turbo engine).
• OEM Fluid Spec: ACDelco DEXRON VI ATF (for 9T50) or ACDelco CVT Fluid (for CVT).
• Drain & Fill Capacity: Approximately 4.0-5.5 quarts (for both 9T50 and CVT).
• Full Overhaul Capacity: 8.5 quarts (9T50) or 8.1 quarts (CVT).
• Filter OEM Part Number: The filter for these transmissions is internal and not typically replaced during a standard fluid service. Verify with your dealer or service manual for overhaul scenarios.
• Recommended Service Interval: 45,000 miles (severe service) or 90,000 miles (normal service).

Fluid Type Explained

The 2018 Chevrolet Malibu uses two different transmissions, and it's critical to use the correct fluid for your specific model. Using the wrong fluid can lead to poor shifting, overheating, and premature transmission failure.

• For the 9-speed 9T50 automatic (found with the 2.0L Turbo engine): The required fluid is DEXRON VI ATF. This is a synthetic fluid developed by GM for its modern automatic transmissions. It offers excellent friction stability, oxidation resistance, and anti-wear properties, ensuring smooth shifts and long life.

• For the VT40/MGR CVT (found with the 1.5L Turbo engine): This transmission requires a specific CVT fluid, often labeled as ACDelco CVT Fluid. Do NOT use standard ATF in a CVT. CVT fluid is engineered with a unique friction profile to allow the belt (or chain) to move smoothly along the pulleys without slipping or causing wear.

Always verify the correct fluid type in your owner's manual or by VIN with a Chevrolet dealership.

Service Procedure

When servicing your Malibu's transmission, you have two main options: a traditional "drain and fill" or a full "fluid exchange."

• Drain and Fill: This is the most common method. It involves removing the transmission drain plug and letting about half of the old fluid drain out. The pan is then refilled with fresh fluid. Because the torque converter and internal passages hold a significant amount of old fluid, this method only replaces about 50-60% of the total volume. It's a straightforward and effective way to refresh the fluid's additives.

• Fluid Exchange: This procedure uses a specialized machine that connects to the transmission cooler lines. It pumps new fluid into the system while simultaneously drawing the old fluid out, replacing nearly 100% of the fluid. This is a more thorough service but also more expensive. It's often recommended for vehicles that have missed a service interval or operate under severe conditions.

The transmission filters on both the 9T50 and the CVT are internal and considered "lifetime" filters. They are not serviceable during a standard fluid change and are only replaced during a complete transmission overhaul or repair.

Service Interval

Chevrolet recommends different service intervals based on driving conditions.

• Normal Service: For most drivers, the recommended service interval is every 90,000 miles. This applies to typical commuting and highway driving.

• Severe Service: If you operate your Malibu under "severe" conditions, the interval is shortened to every 45,000 miles. Severe service includes:

  • Frequent short trips (less than 5 miles).
  • Driving in heavy city traffic in hot weather.
  • Towing trailers or carrying heavy loads.
  • Driving in hilly or mountainous terrain.

Following the severe service schedule is the best way to ensure maximum longevity and performance from your transmission if your driving habits fall into any of these categories.

Common Transmission Problems

While generally reliable, the transmissions in this generation of Malibu can experience some issues:

• 9T50 (9-Speed Automatic): Some owners have reported harsh or delayed shifting, particularly between lower gears (1-2, 2-3). These issues can sometimes be resolved with a software update (re-flash) from a Chevrolet dealer. In other cases, they may indicate an internal issue, such as a faulty solenoid or valve body problem.

• CVT (Continuously Variable Transmission): The most common complaint with the CVT is a shudder or vibration during light acceleration. This can feel like driving over a rumble strip. Sometimes, a fluid change with the correct CVT fluid can resolve this. In more advanced cases, it could point to wear on the belt or pulleys, which may require significant repair or replacement of the transmission unit.

Regular fluid services are the most effective preventative measure against these common problems.

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