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2018 S4 S-Tronic Transmission Fluid Change Interval & DIY

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Diana O. · rep 0 · May 22, 4:30 AM · 1 replies · solved · Question

Hey everyone, I've got a 2018 Audi S4 B9 with the S-Tronic (DSG) transmission, and I'm approaching 40,000 miles. I've heard conflicting information about when the transmission fluid and filter should be changed on these. Some say 40k, others say 60k.

I'm pretty handy with a wrench and have done oil changes and brake jobs before, but a transmission service feels like a bigger undertaking. Is this something a competent DIYer can tackle, or is it best left to the dealership or an independent Audi specialist?

Also, what specific fluid and filter kits are recommended? I want to make sure I'm using the correct OEM-spec parts to avoid any issues down the road. Any tips or guides would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:30 AM

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ClearTheCode guidance (Audi · Maintenance & DIY)

Summary: For 2018 S4 S-Tronic Transmission Fluid Change Interval & DIY, work through these steps on your 2016+ 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 B9 with the S-Tronic (DSG) transmission, and I'm approaching 40,000 miles. I've heard conflicting information about when the transmission fluid and filter should be changed on these. Some say 40k, others say 60k.

I'm pretty handy with a wrench and have done oil changes and brake jobs before, but a transmission service feels like a bigger undertaking. Is this …

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

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