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2018 Q50 Transmission Fluid Change - Is it really 'sealed for life'?

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Laura J. · rep 0 · May 22, 5:08 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport 400

Hey everyone,

I've got a 2018 Infiniti Q50 3.0t with about 75,000 miles on it. Lately, I've been feeling a slight shudder when shifting, especially at lower speeds. I've heard conflicting things about transmission fluid – some say it's 'sealed for life,' others say it absolutely needs changing.

What's the consensus here? Should I be looking into a transmission fluid flush or drain and fill? And if so, what type of fluid should I use for my 2018 Infiniti Q50 Red Sport 400? I want to make sure I'm doing the right thing to keep my car running smoothly.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:08 AM

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ClearTheCode admin answer:

It's a common misconception that modern transmissions, including those in your 2018 Infiniti Q50, are truly 'sealed for life.' While manufacturers might state this, it often refers to the expected lifespan of the first owner or a specific mileage under ideal conditions. For long-term vehicle health, especially with higher mileage, transmission fluid maintenance is crucial.

  1. Understanding the 'Sealed for Life' Myth: Transmission fluid degrades over time and with use, losing its lubricating and cooling properties. This can lead to issues like the shuddering you're experiencing, delayed shifts, or even premature transmission wear.
  2. Recommendation for your 2018 Q50: Given your 75,000 miles and the shuddering symptom, a transmission fluid service is highly recommended. Infiniti's service manual typically suggests inspection at certain intervals, but a proactive drain and fill (or even a flush by a professional) can prevent more serious problems.
  3. Fluid Type: For your 2018 Infiniti Q50, you'll need genuine Nissan Matic S ATF or an equivalent fluid that meets the Matic S specification. Using the incorrect fluid can cause significant transmission damage.
  4. DIY vs. Professional: A drain and fill can be a DIY project for experienced mechanics, but a full flush often requires specialized equipment to ensure all old fluid is removed and new fluid is properly introduced without introducing air. Given the complexity and importance, especially with symptoms, a professional service is often safer.
  5. When to See a Shop: If the shuddering persists after a fluid change, or if you notice any warning lights on your dashboard, it's imperative to have a qualified Infiniti technician diagnose the issue immediately. This could indicate a more serious internal transmission problem.
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