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2018 QX60 AWD: Differential & Transfer Case Fluid Service?

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Heather Y. · rep 0 · May 22, 5:09 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti QX60 AWD

Hey everyone, I have a 2018 Infiniti QX60 AWD with about 75,000 miles on it. I've been pretty good about oil changes and transmission fluid, but I realized I haven't touched the differential or transfer case fluids.

Lately, I've noticed a very slight whine from what sounds like the rear end, especially at lower speeds. It's not loud, but it's there. Could this be related to the differential fluid?

What's the recommended service interval for these fluids on the QX60 AWD? Is this something I can tackle myself, or should I take it to a shop? Any specific fluid types I should be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:09 AM

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ClearTheCode admin answer:

It's great you're thinking about your differential and transfer case fluids! These are often overlooked but crucial for the longevity of your AWD system, especially with 75,000 miles on your 2018 Infiniti QX60.

  1. Understanding the Components: Your QX60 AWD has a front differential (integrated into the transaxle), a rear differential, and a transfer case. Each requires specific fluid.

  2. Recommended Service Intervals:

    • Differentials (Front & Rear): Infiniti generally recommends inspecting these fluids every 30,000 miles or 24 months, and replacing them every 60,000 miles or 48 months under normal driving conditions. If you do a lot of towing, heavy loads, or off-road driving, consider changing them every 30,000 miles.
    • Transfer Case: Similar to differentials, inspection is typically every 30,000 miles, with replacement often recommended around 60,000 miles or 48 months, or sooner for severe use.

  3. Fluid Types:

    • Differentials: You'll typically need a GL-5 rated gear oil. The specific weight (e.g., 75W-90, 80W-90) can vary, so always consult your owner's manual or a Nissan/Infiniti parts department for the exact specification for your 2018 QX60. Using the wrong fluid can lead to premature wear.
    • Transfer Case: This often requires a specific Nissan/Infiniti Matic-J or equivalent fluid. Do not substitute with generic gear oil.

  4. Causes of Whining Noise: A slight whine from the rear end, especially at lower speeds, can indeed be a symptom of old, degraded, or low differential fluid. The fluid lubricates the gears and bearings, and when it breaks down, friction increases, leading to noise and wear. It could also indicate worn bearings or gears themselves.

  5. DIY vs. Shop: Changing differential and transfer case fluids is a moderately difficult DIY task. It involves locating drain and fill plugs, ensuring the vehicle is level, using the correct tools (including a fluid pump for filling), and disposing of old fluid properly. If you're comfortable working under your car and have the right tools and knowledge, it's doable. However, if you're unsure, or if the noise persists after a fluid change, it's best to:

    • See a Shop: A professional technician can properly diagnose the source of the whine (e.g., rule out wheel bearings, brakes, or more serious differential issues), ensure the correct fluids are used, and perform the service safely. They can also inspect for any leaks or excessive play in the drivetrain components.
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