The 5.0-liter twin-turbo V10 Audi BUH was produced from 2008 to 2010 and was installed on the Audi RS6. It has direct injection and two turbochargers (IHI RHF55) and produces 580 hp and 650 Nm.
V10 EA824 family: BSM, BXA, BUJ, BUH.
Specifications
| Production years | 2008-2010 |
| Displacement, cc | 4991 |
| Fuel system | direct injection |
| Power output, hp | 580 |
| Torque output, Nm | 650 |
| Cylinder block | aluminum V10 |
| Block head | aluminum 40v |
| Cylinder bore, mm | 84.5 |
| Piston stroke, mm | 89.0 |
| Compression ratio | 10.5 |
| Features | dry sump |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | on all shafts |
| Turbocharging | two IHI RHF55 |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 8.0 |
| Fuel type | petrol |
| Euro standards | EURO 4 |
| Fuel consumption, L/100 km (for Audi RS6 Avant 2009) — city — highway — combined |
20.4 10.3 14.0 |
| Engine lifespan, km | ~200 000 |
| Weight, kg | 278 |
The engine was installed on:
- Audi RS6 C6 (4F) in 2008 – 2010.
Disadvantages of the Audi BUH engine
- The aluminum block without liners does not tolerate poor fuel and oil;
- Parts of the intake swirl flaps can break off and fall into the cylinders;
- Like all direct-injection engines, it is prone to carbon deposits on the intake valves;
- At about 150,000 km the timing chains often need replacing, which is very expensive;
- Weak points also include ignition coils, the catalytic converter and the high-pressure fuel pumps.
Frequently asked questions about the Audi BUH
How much power does the Audi BUH make?
The Audi BUH develops 580 hp and 650 Nm of torque.
How much oil does the Audi BUH take and which one?
Engine oil capacity: 8.0 liters. Recommended oil: 5W-30.
Does the Audi BUH have a timing belt or chain?
The Audi BUH uses a timing chain.
Is the Audi BUH turbocharged?
Yes, the Audi BUH is turbocharged (two IHI RHF55).
Does the Audi BUH need valve clearance adjustment?
No, the Audi BUH has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Audi BUH last?
The typical lifespan of the Audi BUH is ~200 000 km with proper maintenance.
What is the fuel consumption of the Audi BUH?
Audi RS6 Avant 2009: city 20.4, highway 10.3, combined 14.0 L/100 km.
What cars was the Audi BUH installed on?
Audi RS6 C6 (4F) in 2008 - 2010.
What are the common problems of the Audi BUH?
The aluminum block without liners does not tolerate poor fuel and oil. Parts of the intake swirl flaps can break off and fall into the cylinders. All known problems.
