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How many quarts of transmission fluid does a 6L80 take?

The 6L80 transmission, commonly found in various General Motors vehicles, requires approximately 6 quarts of transmission fluid for a complete fluid change. This information is based on the manufacturer's specifications and industry standards.


Understanding the 6L80 Transmission


The 6L80 is a 6-speed automatic transmission developed by General Motors. It is widely used in a variety of GM vehicles, including Chevrolet, Cadillac, and GMC models. This transmission is known for its durability, smooth shifting, and efficient power delivery.


Transmission Fluid Capacity


According to the manufacturer's recommendations, the 6L80 transmission requires approximately 6 quarts of transmission fluid for a complete fluid change. This amount may vary slightly depending on the specific vehicle model and year, but 6 quarts is the standard guideline.


It's important to use the recommended transmission fluid type specified by the vehicle manufacturer. Using the wrong fluid can lead to premature wear, reduced performance, and even damage to the transmission.


Fluid Change Intervals



  • The 6L80 transmission fluid should be changed at regular intervals, typically every 30,000 to 60,000 miles, or as specified in the vehicle's owner's manual.

  • Proper maintenance, including regular fluid changes, helps ensure the longevity and optimal performance of the 6L80 transmission.

  • It's recommended to have the transmission fluid change performed by a qualified automotive technician to ensure the job is done correctly and the proper fluid is used.


Maintaining the correct transmission fluid level and changing it at the recommended intervals is crucial for the long-term health and performance of the 6L80 transmission in your vehicle.

What is a common failure for a 6L80?


The 6L80 has had a load of transmission problems, some of which directly inhibit drivability. Some of the most common issues include: Cracks in the 1-2-3-4 pistons. Slipping 2nd and 3rd gears.



Is the 6L80 a strong transmission?


GM designed the 6L80 transmission to be able to handle high horsepower/torque applications. However, they can often wear out prematurely.



How many quarts are in a 6L80?


The entire system holds 13.24 quarts. A normal pan removal will require 6.5 quarts to refill.



How many quarts of transmission fluid for a drain and fill?


For draining and refilling, it says you'll replace 30-50% (3.25 quarts to 5.5 quarts - quite a range !). From my reading and researching, no one has even drained 5 quarts when they've done this.



How much transmission fluid does a 6L80 hold?


Some 6L80 / 6L90 transmissions do not use a dipstick. Proper fluid level is achieved when fluid begins to drip from the Level Control Plug opening. Fill transmission only with synthetic fluid included with transmission purchase or Dexron VI. This transmission will require approximately 10 quarts of fluid.



What is the weakness of the 6L80?


What Are Some of the Common Issues with 6L80 Transmission?

  • Cracks in the 1-2-3-4 pistons.
  • Slipping 2nd and 3rd gears.
  • Cracked drum.
  • Skipping 2-3 gears.
  • Clutch Failure.
  • First Gear Slipping.
  • Reverse gear engagement failure.
  • Cracked clutch drum.



Is the 6L80 a bad transmission?


GM designed the 6L80 transmission to be able to handle high horsepower/torque applications. However, they can often wear out prematurely. To correct the many design flaws of this gearbox, Street Smart Transmission upgrades and modifies many of the key internal components during the remanufacturing process.



What happens if you overfill transmission fluid?


Excessive fluid prohibits proper lubrication and cooling and slows the rotating crankshaft, similar to the effect of running through water. When the air above mixes with the high levels of fluid, it creates a foamy substance that saturates the transmission. This can lead to: Part pitting.



What fluid for 6L80 transmission?


According to the owner's manual, the 6L80E requires DEXRON-VI ATF. So you want Mobil DEXRON-VI ATF.



What is the difference between a 6L80 and a 6L80E?


"The main difference is that the 6L80E has much more versatile gear ratios.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.