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2018 Sorento V6 Transmission Fluid Change Interval & Shuddering

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Chris P. · rep 0 · May 22, 3:09 AM · 1 replies · solved · Question

Vehicle: 2018 Kia Sorento SX

Hey everyone, I've got a 2018 Kia Sorento SX with the V6 engine, just hit around 70,000 miles. I'm wondering about the transmission fluid. The owner's manual seems a bit vague on a specific change interval for 'normal' driving conditions, mostly mentioning severe service.

Lately, I've noticed a slight shuddering, especially when accelerating gently from a stop or at lower speeds. It's not constant, but it's enough to make me think about the transmission. Could this be related to old fluid?

Is this something I should tackle myself, or is it best left to a professional? What type of fluid should I use if I do a drain and fill? Any advice on the shuddering would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:09 AM

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ClearTheCode admin answer:

It's great you're thinking proactively about your transmission fluid, especially with those miles and symptoms. A slight shudder can indeed be a sign of aging transmission fluid.

  1. Transmission Fluid Change Interval: For your 2018 Kia Sorento V6, Kia generally recommends inspecting the transmission fluid at 60,000 miles and replacing it under 'severe usage' conditions. While your manual might not specify a hard interval for 'normal' use, many mechanics and enthusiasts recommend a drain and fill every 60,000-100,000 miles for longevity, especially if you're experiencing symptoms like shuddering. Given your mileage and symptoms, a fluid change is a very reasonable first step.

  2. Fluid Type: It is crucial to use the correct transmission fluid. For your Sorento, you will likely need a fluid that meets the SP-IV specification. Always double-check your owner's manual or the dipstick (if equipped) for the exact fluid type. Using the wrong fluid can cause significant transmission damage.

  3. Addressing Shuddering:

    • Fluid Change: A fresh fluid change can often resolve minor shuddering issues by restoring the fluid's lubricating and friction-modifying properties.
    • Filter: Consider replacing the transmission filter if your transmission is equipped with an accessible one during the fluid service. This helps ensure clean fluid circulation.
    • Additives: Some owners have reported success with specific transmission friction modifiers designed to address shudder, but these should be used cautiously and only after ensuring the correct fluid is in place.

  4. DIY vs. Professional: A simple drain and fill can be a DIY task if you're comfortable working under your vehicle and have the right tools. However, a full fluid exchange (which pushes out all old fluid) is typically done with specialized equipment at a shop. Given the shuddering, a professional diagnosis might be beneficial to rule out other issues before just changing the fluid. If the shudder persists after a fluid change, it's definitely time to see a qualified mechanic for a deeper inspection.

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