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2018 Audi S4 B9 DSG Fluid Change Interval & Shuddering

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Amanda S. · rep 0 · May 22, 4:29 AM · 1 replies · solved · Question

Vehicle: 2018 Audi S4 Premium Plus

Hey everyone, I've got a 2018 Audi S4 Premium Plus with about 65,000 miles on it. I'm starting to notice a slight shudder when shifting, especially at lower speeds or when downshifting. I'm wondering if it's time for a DSG transmission fluid and filter change.

What's the recommended interval for the B9 S4's S-Tronic transmission? I've seen conflicting information online, some saying 40k, others 60k. Also, is this shuddering a common symptom of old fluid, or could it be something more serious? I want to make sure I'm doing the right maintenance to keep this car running smoothly.

Any DIY tips or things to watch out for if I decide to tackle this myself? Or is this strictly a dealer job? Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:29 AM

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ClearTheCode admin answer:

The shuddering you're experiencing in your 2018 Audi S4 B9 at 65,000 miles is a common indicator that your S-Tronic (DSG) transmission fluid and filter are due for replacement. Audi's recommended service interval for the S-Tronic transmission fluid change is typically every 40,000 miles or 6 years, whichever comes first. At 65,000 miles, you're definitely past due, which could be contributing to the shifting issues.

Causes of Shuddering:

  1. Degraded Transmission Fluid: Over time, the fluid loses its lubricating properties and can become contaminated, leading to increased friction and less smooth shifts.
  2. Clogged Filter: A dirty transmission filter restricts fluid flow, impacting hydraulic pressure and shift quality.
  3. Mechatronic Unit Issues: While less common at this mileage, severe shuddering can sometimes point to problems with the mechatronic unit, which controls the shifting.

When to See a Shop: While a DSG fluid and filter change is a common maintenance item, it's a complex procedure that requires specific tools (like a VCDS or ODIS system for temperature monitoring and fluid level setting) and specialized fluid. It's generally recommended to have this service performed by an experienced Audi technician or a reputable independent shop specializing in European vehicles. Incorrect fluid levels or improper procedures can cause significant damage to the transmission.

DIY Considerations:

  • Special Tools: You'll need a fill adapter, a diagnostic tool to monitor transmission temperature, and a torque wrench.
  • Fluid Type: Use only Audi-approved DSG fluid (e.g., G 052 529 A2 or equivalent).
  • Procedure: The process involves draining, replacing the filter, and refilling while monitoring temperature to achieve the correct fluid level. It's not a simple drain-and-fill like engine oil.

If the shuddering persists after the fluid and filter change, or if you notice any warning lights (e.g., Check Engine Light with codes like P0700 - Transmission Control System Malfunction), it's crucial to have the transmission professionally diagnosed immediately.

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