ZF 8HP Transmission Fluid Service - BMW G-Chassis (M-Models)
Description
BMW ZF 8HP Transmission fluid service is a maintenance procedure for changing the transmission fluid in a vehicle equipped with the ZF 8HP automatic transmission - an 8-speed automatic gearbox used widely across BMW G-Chassis models (and F8X M8).
BMW may label the transmission as “lifetime fill,” but regular servicing is strongly recommended for longevity. ZF (manufacturer) recommends fluid and filter change every ~37,000 to 50,000 miles. The 8HP transmission relies on clean, high-quality fluid to operate properly. Over time, fluid degrades due to heat and contamination and replacing the fluid helps prevent shifting issues, overheating, and long-term damage.
What the 8HP Transmission Fluid Service includes
- Drain old transmission fluid
- Replace transmission pan & filter
- Clean surfaces & install new pan
- Refill with fresh fluid (ZF Lifeguard 8 fluid or approved equivalent)
- Reset transmission adaptations
Fluid level is set using a specific temperature range (typically 30–50°C / 86–122°F) while the engine is running and the transmission is cycled through gears.
Vehicles Supported
BMW G87 M2
BMW G8X M3/M4, including Competition
BMW G90 M5
BMW F90/F91/F92 M9, including Competition