The company assembled the 4.2-liter Audi BFM or A8 D3 4.2 quattro engine from 2002 to 2006 and installed it only on all-wheel drive modifications of the famous A8 sedan in the D3 body. There was a version of this power unit with a volume of 3.7 liters and its own BFL index.
3.7-4.2 V8 EA824 family: AEW, ABZ, BFL, BFM, AXQ, BVJ, CDRA, BAR.
Specifications
| Production years | 2002-2006 |
| Displacement, cc | 4172 |
| Fuel system | distributed injection |
| Power output, hp | 335 |
| Torque output, Nm | 430 |
| Cylinder block | aluminum V8 |
| Block head | aluminum 40v |
| Cylinder bore, mm | 84.5 |
| Piston stroke, mm | 93 |
| Compression ratio | 11.0 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | belt & 2 chains |
| Phase regulator | yes |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 7.5 |
| Fuel type | petrol |
| Euro standards | EURO 4 |
| Fuel consumption, L/100 km (for Audi A8 quattro 2004) — city — highway — combined |
17.5 8.7 11.9 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 199 |
The engine was installed on:
- Audi A8 D3 (4E) in 2002 – 2006.
Disadvantages of the Audi BFM engine
- Despite the aluminum block, seizures in the cylinders are rare here.
- However, with savings on oil and frequent overheating, they will not keep you waiting.
- Most of the problems here are delivered by unreliable hydraulic timing chain tensioners.
- Try to monitor the condition of the timing belt, or if it breaks, the valves will bend.
- Oil leaks are also common, especially at the junction of the engine with the gearbox.
Frequently asked questions about the Audi BFM
How much power does the Audi BFM make?
The Audi BFM develops 335 hp and 430 Nm of torque.
How much oil does the Audi BFM take and which one?
Engine oil capacity: 7.5 liters. Recommended oil: 5W-30.
Does the Audi BFM have a timing belt or chain?
Timing drive of the Audi BFM: belt & 2 chains.
Is the Audi BFM turbocharged?
No, the Audi BFM is naturally aspirated.
Does the Audi BFM need valve clearance adjustment?
No, the Audi BFM has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Audi BFM last?
The typical lifespan of the Audi BFM is ~300 000 km with proper maintenance.
What is the fuel consumption of the Audi BFM?
Audi A8 quattro 2004: city 17.5, highway 8.7, combined 11.9 L/100 km.
What cars was the Audi BFM installed on?
Audi A8 D3 (4E) in 2002 - 2006.
What are the common problems of the Audi BFM?
Despite the aluminum block, seizures in the cylinders are rare here. However, with savings on oil and frequent overheating, they will not keep you waiting. All known problems.
