Gearbox oil Opel Astra K 6T30 — viscosity and OEM spec
Gearbox oil for Opel Astra K 6T30 (2015–2021) — correct viscosity, OEM specification, fill volume and change interval.
Gearbox Specifications
| Parameter | Value |
|---|---|
| Make / Model | Opel Astra K |
| Gearbox type | automatic |
| Gearbox code | 6T30 |
| Production Years | 2015–2021 |
| Oil viscosity | Dexron VI |
| OEM specification | GM Dexron VI |
| Fill volume | 6.5 L |
| Change interval | 80000 |
“Lifetime” fill in DSG and CVT gearboxes does not mean never change the oil — manufacturers recommend changing every 60,000 km to preserve gearbox life.
Approved Oils for 6T30
GM Genuine Dexron VI, Liqui Moly ATF VI, Castrol Transmax ATF
Automatic Gearbox — Key Points
Automatic gearbox: A standard drain-and-fill replaces ~60% of the fluid. Full flush with a flush machine is recommended every 80,000–120,000 km.
FAQ
What oil goes in Opel Astra K 6T30?
Viscosity Dexron VI, specification GM Dexron VI, volume 6.5 L. Suitable brands: GM Genuine Dexron VI, Liqui Moly ATF VI, Castrol Transmax ATF.
When should the gearbox oil be changed on Opel Astra K?
Every 80000 km.
Can I use a universal ATF instead of GM Dexron VI?
No. The 6T30 requires strict compliance with GM Dexron VI. A universal ATF lacks the correct friction characteristics and will cause premature wear.
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