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DIY Rear Differential Fluid Change on 2018 Q50 Red Sport - What Fluid & How Often?

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Chris P. · rep 0 · May 22, 5:09 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport

Hey everyone,

I've got a 2018 Infiniti Q50 Red Sport with about 60,000 miles on it. I'm pretty good with basic maintenance and I'm thinking about tackling the rear differential fluid change myself. I haven't found a super clear guide specifically for the Red Sport model, and I'm wondering if there are any special considerations for the electronic limited-slip differential (eLSD) if my car has it.

What type of fluid should I be using? I've seen different recommendations for synthetic gear oil, but I want to make sure I get the right spec for Infiniti. Also, what's the recommended service interval for this on the Q50? I do a mix of city and highway driving, no track use.

Any tips or tricks for getting to the fill and drain plugs? I'm hoping it's not too much of a pain. Thanks in advance for the help!

✓ Accepted solution

ClearTheCode Admin

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

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Hello Chris P.,

Changing your rear differential fluid is a great DIY maintenance task that can extend the life of your differential. Here's what you need to know for your 2018 Infiniti Q50 Red Sport:

  1. Fluid Specification: For your 2018 Infiniti Q50 Red Sport, which likely has the electronic limited-slip differential (eLSD) if it's a 3.0t Red Sport, you must use a specific fluid. Infiniti recommends Genuine Nissan Differential Oil Hypoid Super GL-5 75W-90. It's crucial to use this exact fluid or an equivalent that meets the GL-5 specification and is specifically designed for limited-slip differentials, as the eLSD requires proper friction modifiers to operate correctly. Using the wrong fluid can lead to premature wear or improper eLSD function.

  2. Service Interval: Infiniti generally recommends inspecting the differential fluid every 30,000 miles or 24 months, and replacing it every 60,000 miles or 48 months under normal driving conditions. If you engage in heavy towing, frequent short trips, or aggressive driving, you might consider changing it closer to every 30,000-40,000 miles.

  3. Tools and Procedure:

    • You'll need a 10mm hex socket for both the fill and drain plugs. Always remove the fill plug first to ensure you can refill the differential before draining it.
    • Ensure the vehicle is level and safely supported on jack stands or a lift.
    • Have a drain pan ready that can hold at least 2 quarts of fluid.
    • The fill plug is typically on the upper side of the differential housing, and the drain plug is on the bottom.
    • Torque specifications are important: typically around 25 ft-lbs for both plugs, but always confirm with your service manual.
    • Fill until the fluid just begins to seep out of the fill hole.

  4. When to See a Shop: If you notice any unusual noises coming from the rear differential (whining, clunking), or if the drained fluid contains significant metal shavings or has a burnt smell, it might indicate internal wear. In such cases, it's best to have a professional mechanic inspect the differential. If you're uncomfortable with working under the car or don't have the proper tools, a shop can perform this service relatively quickly.

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