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2017 Sorento Transmission Fluid Change Interval & DIY

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Sarah K. · rep 0 · May 25, 2:11 AM · 1 replies · solved · Question

Vehicle: 2017 Kia Sorento EX

Hey everyone,

I have a 2017 Kia Sorento EX with about 85,000 miles on it. I've been pretty good about regular oil changes and tire rotations, but I'm starting to wonder about the transmission fluid. The owner's manual seems a bit vague on the exact interval for a fluid change, especially under normal driving conditions.

I'm not sure if it's a 'lifetime' fluid or if it actually needs to be changed. I do a mix of city and highway driving, no heavy towing or anything. Has anyone with a similar Sorento gone through this already? What's the recommended mileage for a transmission fluid service?

Also, is this something a reasonably handy DIYer can tackle, or is it best left to the dealership? I've seen some videos, but I'm a bit hesitant with transmission work. Any advice or experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:11 AM

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ClearTheCode admin answer:

It's a common misconception that modern transmission fluids are truly 'lifetime' fluids. While they are designed for extended service, they still degrade over time and mileage, especially with heat and stress. For your 2017 Kia Sorento EX, a good general guideline for transmission fluid replacement under normal driving conditions is every 60,000 to 100,000 miles. If you do a lot of stop-and-go city driving, heavy towing, or live in extreme climates, you might consider doing it closer to the 60,000-mile mark.

Here are some key points:

  1. Check Your Manual: While you mentioned it's vague, double-check the 'Maintenance Schedule' section for any specific conditions that might trigger an earlier change. Kia often has different intervals for 'normal' versus 'severe' driving conditions.
  2. Fluid Type: Ensure you use the correct OEM-specified transmission fluid. Using the wrong fluid can lead to serious transmission issues.
  3. DIY Difficulty: A simple drain and fill can be a DIY job for someone with moderate mechanical skills. It typically involves draining the fluid from a pan plug, replacing the drain plug, and refilling through the dipstick tube or fill port. However, a full fluid exchange (which replaces more of the fluid in the torque converter and lines) usually requires specialized equipment and is best done by a professional shop.
  4. When to See a Shop:
    • If you're uncomfortable with the process, especially ensuring the correct fluid level and type.
    • If you want a complete fluid exchange rather than just a drain and fill.
    • If you notice any unusual shifting, slipping, or grinding noises, as these could indicate existing transmission problems that need professional diagnosis before a fluid change.

Regular transmission fluid maintenance can significantly extend the life of your transmission and prevent costly repairs down the road.

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