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2018 F-150 3.5L EcoBoost Transmission Fluid Change Interval & Type

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Ashley M. · 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 wondering about the transmission fluid.

What's the recommended service interval for a transmission fluid and filter change on these trucks? Also, what specific type of Mercon fluid should I be using? I've heard conflicting things about Mercon ULV versus other types, and I want to make sure I get it right.

Is this something a competent DIYer can tackle, or is it best left to the dealership? Any tips or special tools needed would be greatly appreciated!

✓ 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 3.5L EcoBoost Transmission Fluid Change Interval & Type, 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 wondering about the transmission fluid.

What's the recommended service interval for a transmission fluid and filter change on these trucks? Also, what specific type of Mercon fluid should I be using? I've heard conflicting things about Mercon ULV…

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

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