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2018 F-150 Lariat Transmission Fluid Change Interval & Shudder

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Mike T. · rep 0 · May 22, 2:28 AM · 1 replies · solved · Question

Hey everyone,

I've got a 2018 Ford F-150 Lariat with the 3.5L EcoBoost engine and the 10-speed automatic transmission. I'm approaching 75,000 miles and I'm wondering about the transmission fluid. The owner's manual seems a bit vague on the exact interval for a fluid change, especially for 'normal' driving conditions.

Lately, I've noticed a very slight shudder when shifting into higher gears, particularly when the truck is cold. It's not severe, but it's enough to make me think about preventative maintenance. Is this a common symptom for these transmissions, and could it be related to the fluid?

What are your recommendations for a transmission fluid change? Is it something a competent DIYer can tackle, or is it best left to the dealership or a specialist shop? Any specific fluid types or procedures I should be aware of? Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:28 AM

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ClearTheCode guidance (Ford · Maintenance & DIY)

Summary: For 2018 F-150 Lariat Transmission Fluid Change Interval & Shudder, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone,

I've got a 2018 Ford F-150 Lariat with the 3.5L EcoBoost engine and the 10-speed automatic transmission. I'm approaching 75,000 miles and I'm wondering about the transmission fluid. The owner's manual seems a bit vague on the exact interval for a fluid change, especially for 'normal' driving conditions.

Lately, I've noticed a very slight shudder when shifting into higher gears, par…

This is educational guidance, not a substitute for hands-on diagnosis.

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