ZF 6HP28 6-Speed Automatic Transmission (BMW M / High-Performance) · BMW / MINI · Expert rebuild service since 1987. Lifetime warranty. Free diagnostic.
2006–2010 BMW M5 (E60 S85 V10), 2006–2010 BMW M6 (E63/E64 S85 V10), 2008–2013 BMW M3 (E90/E92/E93 SMG-equipped), 2009–2013 BMW 7 Series (F01 730d–760Li)
| Configuration | 6-speed automatic RWD transmission (high-performance rated) |
|---|---|
| Gear Ratios | 1st 4.17:1 · 2nd 2.34:1 · 3rd 1.52:1 · 4th 1.14:1 · 5th 0.87:1 · 6th 0.69:1 · Rev 3.40:1 |
| Fluid Type | ZF LifeGuardFluid 6 |
| Fluid Capacity | 9.5 qts total, 4.5 qts service refill |
The V10 S85 generates extreme heat that deteriorates the mechatronic harness faster than any other 6HP application. BMW M5/M6 mechatronic failure is a well-documented issue.
Symptoms: Limp mode, DTC 4D0C, harsh gear engagement, MIL on — very common on M5/M6 above 80,000 miles
Track and performance use of M5/M6 models rapidly wears the clutch packs designed for street use.
Symptoms: Slip under high-RPM acceleration, harsh shifts when hot, DTC P0734–P0740
The V10 S85 torque output exceeds the 6HP28's original design spec under repeated WOT applications. Pump wear causes pressure loss.
Symptoms: Soft shifts, slip during hard acceleration, transmission hunting on hills
6HP28 rebuild replaces mechatronic unit (upgraded harness), upgraded clutch packs for M-rated torque, hydraulic pump, and all seals. Torque converter is rebuilt with upgraded friction disc. ZF LifeGuardFluid 6 used.
ZF LifeGuardFluid 6 every 30,000 miles for M-powered applications — shorter interval than standard due to V10 heat loads. If tracking your M5, change fluid after every track event.
E60 M5, E63/E64 M6 with V10 S85 engine, and some E9x M3 automatic-equipped versions.
It's a weak link in the E60 M5 drivetrain. Mechatronic failure is extremely common above 80,000 miles in V10 applications.
A full rebuild ranges $2,600–$3,400 at Chicago Transmission due to M-spec upgraded components.
ZF LifeGuardFluid 6, changed every 30,000 miles in M applications.
With upgraded clutch packs from a rebuild and fresh ZF fluid after each track event, it can be track-capable — but it is not factory-rated for sustained track use.
Free diagnostic, written estimate, lifetime warranty. Chicago's ZF 6HP28 rebuild specialists since 1987.
