Gearbox oil BMW 3 Series G20 GS6-45BZ — viscosity and OEM spec
Gearbox oil for BMW 3 Series G20 GS6-45BZ (2019–2025) — correct viscosity, OEM specification, fill volume and change interval.
Gearbox Specifications
| Parameter | Value |
|---|---|
| Make / Model | BMW 3 Series G20 |
| Gearbox type | manual |
| Gearbox code | GS6-45BZ |
| Production Years | 2019–2025 |
| Oil viscosity | 75W-85 |
| OEM specification | BMW MTF LT-4 |
| Fill volume | 1.4 L |
| Change interval | 0 |
“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 GS6-45BZ
BMW Genuine MTF LT-4, Pentosin MTF-4, Fuchs Titan MTF
Manual Gearbox — Key Points
Manual gearbox: Drain on a warm gearbox for best flow. Fill to the level plug hole and refit immediately.
FAQ
What oil goes in BMW 3 Series G20 GS6-45BZ?
Viscosity 75W-85, specification BMW MTF LT-4, volume 1.4 L. Suitable brands: BMW Genuine MTF LT-4, Pentosin MTF-4, Fuchs Titan MTF.
When should the gearbox oil be changed on BMW 3 Series G20?
Every 60,000 km is recommended despite the lifetime label.
Can I use a universal ATF instead of BMW MTF LT-4?
No. The GS6-45BZ requires strict compliance with BMW MTF LT-4. A universal ATF lacks the correct friction characteristics and will cause premature wear.
Where to Buy