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S-tronic Transmission Fluid Change Schedule & DIY for B9 S4

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Chris P. · rep 0 · May 25, 3:15 AM · 1 replies · solved · Question

Hey everyone, I've got a 2018 Audi S4 Premium Plus with about 65,000 miles on it. I'm wondering about the S-tronic transmission fluid. The dealership says it's due, but I'm curious if this is something I can tackle myself or if it's strictly a shop job.

I've done oil changes and brake jobs before, but a transmission fluid flush seems a bit more involved. What's the recommended interval for the B9 S4? Are there any special tools or procedures I should be aware of if I attempt this DIY?

Also, what fluid brands are recommended? I want to make sure I'm using the correct type to avoid any issues down the road. Any advice or experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:15 AM

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ClearTheCode guidance (Audi · Maintenance & DIY)

Summary: For S-tronic Transmission Fluid Change Schedule & DIY for B9 S4, work through these steps on your 2015+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone, I've got a 2018 Audi S4 Premium Plus with about 65,000 miles on it. I'm wondering about the S-tronic transmission fluid. The dealership says it's due, but I'm curious if this is something I can tackle myself or if it's strictly a shop job.

I've done oil changes and brake jobs before, but a transmission fluid flush seems a bit more involved. What's the recommended interval for the B9…

This is educational guidance, not a substitute for hands-on diagnosis.

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