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2018 MKZ Transmission Fluid Service - When to Change?

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Mike T. · rep 0 · May 25, 4:31 AM · 1 replies · solved · Question

Vehicle: 2018 Lincoln MKZ Reserve

My 2018 Lincoln MKZ Reserve with about 75,000 miles has recently started feeling a bit sluggish when shifting, especially from 2nd to 3rd. It's not a harsh jolt, but definitely noticeable. I haven't had the transmission fluid changed before, and the owner's manual seems a bit vague on the exact interval for "normal" driving conditions.

I mostly do city driving with some highway commutes. Is it time for a transmission fluid flush or just a drain and fill? What's the recommended interval for a car like mine? I want to make sure I'm not causing any long-term damage.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:31 AM

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ClearTheCode admin answer:

Sluggish shifting in your 2018 Lincoln MKZ Reserve at 75,000 miles could indeed point to transmission fluid issues. It's a common concern as vehicles age.

  1. Check Your Owner's Manual: While you mentioned it's vague, double-check for a "Severe Duty" or "Special Operating Conditions" schedule. Lincoln often recommends transmission fluid service around 60,000 to 100,000 miles for normal driving, but more frequently (e.g., 30,000-50,000 miles) if you do a lot of towing, heavy city driving, or driving in extreme temperatures. Your city driving might lean towards a shorter interval.

  2. Drain and Fill vs. Flush:

    • Drain and Fill: This involves draining the fluid from the transmission pan and refilling it. It replaces only a portion of the total fluid (typically 40-60%) but is generally safer and less risky for older transmissions. It's often recommended over a full flush.
    • Flush: This process uses a machine to force new fluid through the transmission, removing nearly all the old fluid. While it sounds thorough, it can sometimes dislodge debris in older transmissions, leading to new problems. For a transmission that hasn't had regular service, a flush can be risky.

  3. Causes of Sluggish Shifting:

    • Degraded Fluid: Over time, transmission fluid breaks down, losing its lubricating and cooling properties. This can lead to increased friction and heat, affecting shift quality.
    • Low Fluid Level: A low fluid level can cause pressure issues, leading to poor shifting.
    • Worn Components: While less likely to be the primary cause at 75,000 miles without other symptoms, worn internal components can also affect shifts.

  4. When to See a Shop:

    • Immediate Inspection: If the sluggishness worsens, you hear grinding noises, or the check engine light illuminates, get it to a professional immediately.
    • Fluid Condition Check: A reputable shop can inspect your current transmission fluid for color, smell, and presence of metal particles, which can indicate internal wear. This will help determine the best course of action.
    • Diagnostic Scan: They can also perform a diagnostic scan to check for any stored transmission-related trouble codes, even if the check engine light isn't on.
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