The 3.7-liter V8 Audi BFL engine was produced at the concern’s enterprises from 2002 to 2006 and was installed only on the pre-restyling modification of the A8 executive sedan in the D3 body. This engine was distinguished from its predecessor by the presence of new cylinder heads with 5 valves per cylinder.
3.7-4.2 V8 EA824 family: AEW, ABZ, BFL, BFM, AXQ, BVJ, CDRA, BAR.
Specifications
| Production years | 2002-2006 |
| Displacement, cc | 3697 |
| Fuel system | distributed injection |
| Power output, hp | 280 |
| Torque output, Nm | 350 |
| Cylinder block | aluminum V8 |
| Block head | aluminum 40v |
| Cylinder bore, mm | 84.5 |
| Piston stroke, mm | 82.4 |
| Compression ratio | 11.0 |
| Features | 5V |
| 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 3.7 quattro 2004) — city — highway — combined |
17.1 8.6 11.8 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 197 |
The engine was installed on:
- Audi A8 D3 (4E) in 2002 – 2006.
Disadvantages of the Audi BFL engine
- This is a reliable and very durable power unit, but only with proper care;
- Bad fuel and overheating cause scuffing in the cylinders, because there are no liners there;
- It is very important to monitor the condition of the timing belt, since if it breaks, the valves bend;
- Camshaft gears and hydraulic chain tensioners have a low service life;
- And the plastic rods of the dampers in the intake manifold regularly break off;
- Weak points also include the crankshaft rear oil seal and the crankcase ventilation valve membrane.
Frequently asked questions about the Audi BFL
How much power does the Audi BFL make?
The Audi BFL develops 280 hp and 350 Nm of torque.
How much oil does the Audi BFL take and which one?
Engine oil capacity: 7.5 liters. Recommended oil: 5W-30.
Does the Audi BFL have a timing belt or chain?
Timing drive of the Audi BFL: belt & 2 chains.
Is the Audi BFL turbocharged?
No, the Audi BFL is naturally aspirated.
Does the Audi BFL need valve clearance adjustment?
No, the Audi BFL has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Audi BFL last?
The typical lifespan of the Audi BFL is ~300 000 km with proper maintenance.
What is the fuel consumption of the Audi BFL?
Audi A8 3.7 quattro 2004: city 17.1, highway 8.6, combined 11.8 L/100 km.
What cars was the Audi BFL installed on?
Audi A8 D3 (4E) in 2002 - 2006.
What are the common problems of the Audi BFL?
This is a reliable and very durable power unit, but only with proper care. Bad fuel and overheating cause scuffing in the cylinders, because there are no liners there. All known problems.
