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2020 Enclave Avenir Transmission Fluid: Is it really 'lifetime'? When to change?

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Amanda S. · rep 0 · May 22, 3:53 AM · 1 replies · solved · Question

Vehicle: 2020 Buick Enclave Avenir

Hi everyone,

I own a 2020 Buick Enclave Avenir with the 3.6L V6 and the 9-speed automatic transmission. I've heard conflicting information about transmission fluid. Some say it's 'lifetime' fluid and never needs changing, while others recommend regular service.

What's the official word for my Enclave? If it does need changing, what's the recommended interval and what type of fluid should be used? I want to make sure I'm doing everything to keep my transmission healthy for the long haul.

Thanks for any insights!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:53 AM

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Hello David,

The term 'lifetime' fluid can be misleading and often refers to the expected lifetime of the original warranty period, not the vehicle's entire lifespan. For your 2020 Buick Enclave Avenir with the 9-speed automatic transmission, regular transmission fluid maintenance is indeed recommended under certain conditions.

  1. GM's Official Stance:

    • General Motors recommends changing the automatic transmission fluid and filter every 97,500 miles (150,000 km) for vehicles primarily driven under normal conditions.
    • However, if your vehicle is primarily driven under severe conditions (e.g., heavy city traffic, frequent towing, mountainous terrain, or commercial use), the interval should be reduced to 45,000 miles (72,000 km).

  2. Fluid Type:

    • Your 9-speed transmission requires ACDelco DEXRON-VI Automatic Transmission Fluid. Using any other type of fluid can lead to transmission damage and void your warranty.

  3. Why Change It?

    • Transmission fluid lubricates, cools, and cleans the internal components of the transmission. Over time and with use, the fluid breaks down, loses its lubricating properties, and can accumulate wear particles. This breakdown can lead to increased friction, overheating, and premature wear of transmission components.

  4. DIY Considerations:

    • A transmission fluid and filter change on a 9-speed automatic is generally more complex than an engine oil change. It often involves specific fill procedures, temperature checks, and can be messy. There might not be a traditional dipstick for checking fluid levels, requiring specialized tools or knowledge.

When to See a Shop:

  • Due to the complexity and precision required for a proper transmission fluid and filter change, especially on modern multi-speed transmissions, it is highly recommended to have this service performed by a qualified technician at a dealership or a reputable independent shop. They have the specialized tools, diagnostic equipment, and experience to ensure the job is done correctly, preventing costly transmission issues down the road.
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