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2018 S4 S tronic Transmission Fluid Change Interval & DIY Difficulty

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Melissa G. · rep 0 · May 22, 4:28 AM · 1 replies · solved · Question

Vehicle: 2018 Audi S4 Prestige

Hey everyone, I've got a 2018 Audi S4 Prestige with about 38,000 miles on it. I'm starting to think about the transmission fluid service for the S tronic. I've heard different things about when it should be done, some say 40k, others say later.

What's the recommended interval for the B9 S4's S tronic (DSG) fluid and filter change? Also, how difficult is this job to DIY? I'm pretty handy with a wrench and have done oil changes and brake jobs before, but a transmission feels like a different beast.

Are there any special tools required? I'm trying to decide if this is something I should tackle myself to save some money or if it's better left to the dealership or an independent Audi specialist. Any advice or experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:28 AM

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ClearTheCode admin answer:

The S tronic (DSG) transmission in your 2018 Audi S4 is a critical component, and proper fluid maintenance is key to its longevity and performance. Here's what you need to know:

1. Recommended Service Interval:

  • For most Audi S tronic (DSG) transmissions, the manufacturer-recommended service interval for the transmission fluid and filter change is typically 40,000 miles (60,000 km). It's crucial to adhere to this schedule to ensure optimal shifting and prevent premature wear.

2. DIY Difficulty & Special Tools:

  • Difficulty: This is generally considered a moderately difficult to advanced DIY job. It's more involved than a typical oil change due to the specific procedures and tools required.
  • Special Tools: You will need several specialized items:
    1. VCDS (VAG-COM Diagnostic System) or equivalent scan tool: Essential for monitoring transmission temperature during the fill procedure and clearing any potential codes.
    2. Fluid fill adapter: A specific tool that screws into the transmission's fill port, allowing you to pump new fluid in from the bottom.
    3. Torque wrench: Accurate torque values are critical for drain and fill plugs.
    4. Fluid extractor/pump: To get the new fluid into the transmission.
    5. Lift or sturdy jack stands: To safely elevate the vehicle and ensure it's level.

3. Causes of Neglect:

  • Failing to change the fluid can lead to degraded shifting quality, increased wear on clutch packs and mechatronic unit, and eventually costly transmission repairs. Old fluid loses its lubricating properties and can't dissipate heat as effectively.

4. When to See a Shop:

  • If you're not comfortable with the specific procedures, don't have the necessary tools (especially the VCDS/scan tool and fill adapter), or lack experience with transmission services, it's highly recommended to take your S4 to an authorized Audi dealership or a reputable independent Audi specialist. They have the expertise, tools, and genuine Audi parts to perform the service correctly. While DIY can save money, an incorrect procedure can lead to significant transmission damage, far outweighing any initial savings.
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