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2018 CX-5 Transmission Fluid Change Interval & Shuddering

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Mike T. · rep 0 · May 25, 3:36 AM · 1 replies · solved · Question

Vehicle: 2018 Mazda CX-5 Grand Touring

Hey everyone, I've got a 2018 Mazda CX-5 Grand Touring with about 75,000 miles on it. I'm wondering about the transmission fluid. The owner's manual says it's 'lifetime,' but I've heard conflicting advice from mechanics. Lately, I've noticed a slight shuddering feeling when accelerating from a stop, especially when the engine is warm. It's not constant, but it's definitely noticeable.

Should I be looking into a transmission fluid change or flush? I want to keep this car running strong for a long time, and I'm a bit worried about potential transmission issues down the road. What are your experiences with CX-5 transmissions at this mileage?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:36 AM

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ClearTheCode admin answer:

Transmission fluid maintenance is a common point of confusion, especially with 'lifetime' fluid claims. While Mazda's SKYACTIV transmissions are designed for durability, 'lifetime' often refers to the expected life of the first owner, or a period after which the manufacturer expects many owners to have moved on. For long-term ownership, especially beyond 60,000-75,000 miles, changing the transmission fluid is generally recommended.

Here’s what you should consider:

  1. Fluid Change vs. Flush: A drain and fill is generally safer and recommended for higher mileage vehicles. A flush, which uses a machine to force new fluid through the system, can sometimes dislodge deposits in older transmissions, potentially causing more harm than good. A drain and fill replaces only a portion of the fluid, so multiple drain and fills over a short period (e.g., 500-1000 miles apart) can be very effective.
  2. Shuddering Causes:
    • Worn Transmission Fluid: Old, degraded fluid loses its lubrication properties, leading to increased friction and shuddering.
    • Torque Converter Issues: The torque converter clutch can cause shuddering if it's not engaging or disengaging smoothly. This can be exacerbated by old fluid.
    • Engine Misfire: Less common for transmission-like shudder, but a slight engine misfire can sometimes be felt through the drivetrain.
    • Other Drivetrain Components: Worn CV joints, driveshafts, or even engine/transmission mounts could contribute to vibrations.
  3. When to See a Shop:
    • If the shuddering is consistent, worsening, or accompanied by any warning lights (like a check engine light) or difficulty shifting, get it inspected immediately.
    • A qualified Mazda technician can perform a diagnostic scan (even if no CEL is on, pending codes might exist) and physically inspect the transmission fluid condition (color, smell) and other drivetrain components.
    • They can also check for any technical service bulletins (TSBs) related to transmission shudder for your specific model year.

For your 2018 CX-5 at 75,000 miles, a transmission fluid drain and fill with genuine Mazda ATF-FZ fluid is a proactive step that could resolve the shuddering and extend the life of your transmission. Always use the correct OEM fluid specification.

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