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Rough Shifts on 2018 Enclave - Time for Transmission Fluid Service?

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Christine P. · rep 0 · May 22, 3:53 AM · 1 replies · solved · Question

Vehicle: 2018 Buick Enclave Premium

Hey everyone,

I've got a 2018 Buick Enclave Premium with about 85,000 miles on it. Lately, I've noticed the transmission feeling a bit rough, especially when shifting between 2nd and 3rd gear. It's not a huge jolt, but it's definitely noticeable and wasn't there before.

I'm wondering if it's time to get the transmission fluid changed. I haven't had it done yet, and I know some manufacturers say it's 'lifetime' fluid, but I'm skeptical. What are the recommended intervals for these Enclaves? Should I just do a drain and fill, or is a full flush better?

Any advice on what type of fluid to use or what to look out for would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer:

It's a common misconception that 'lifetime' transmission fluid truly lasts the life of the vehicle without service. For your 2018 Buick Enclave Premium, especially with 85,000 miles and experiencing rough shifts, it's definitely a good idea to consider transmission fluid service.

Here's what you should know:

  1. Service Interval: While Buick's official stance might vary, many experienced technicians recommend a transmission fluid drain and fill every 60,000 to 100,000 miles, especially under severe driving conditions (towing, heavy city traffic, extreme temperatures). Given your mileage and symptoms, you're right in that window.
  2. Fluid Type: Your Enclave's 9-speed automatic transmission (likely the 9T50 or similar) requires DEXRON-VI automatic transmission fluid. Using any other type can cause significant issues and damage. Always confirm with your owner's manual or a certified Buick dealer.
  3. Drain and Fill vs. Flush:
    • Drain and Fill: This involves draining the fluid from the pan and refilling it. It replaces only a portion (typically 4-6 quarts) of the total fluid, leaving some old fluid in the torque converter and lines. It's generally safer for higher mileage transmissions as it doesn't dislodge potential debris. You might need to do this multiple times over a few thousand miles to replace more of the fluid.
    • Flush: A flush uses a machine to push new fluid through the entire system, replacing nearly all the old fluid. While more thorough, it can sometimes dislodge deposits in older, high-mileage transmissions, potentially causing new problems. If your transmission has never been serviced, a flush might be risky.

Recommendation: Given the symptoms and mileage, a drain and fill is generally the safer first step. If the rough shifts persist after a drain and fill, then further diagnostics would be needed. It's also wise to replace the transmission filter during this service, as a clogged filter can restrict fluid flow.

When to See a Shop: If the rough shifts are severe, accompanied by warning lights (like a 'Service Transmission' message), or if the fluid looks burnt or has metal shavings, it's best to have a professional diagnose the issue immediately. These could indicate more serious internal wear.

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