The 2.4-liter 5-cylinder Audi AAS diesel engine was produced from 1991 to 1994 and was installed only on the fourth generation of the popular Audi 100 model. This unit is an updated version of the 3D diesel engine known from the C3 model.
EA381 family: CN, AAS, AAT, 1T, AEL, AHD, BJK, BJM.
Specifications
| Production years | 1991-1994 |
| Displacement, cc | 2370 |
| Fuel system | prechambers |
| Power output, hp | 82 |
| Torque output, Nm | 164 |
| Cylinder block | cast iron R5 |
| Block head | aluminum 10v |
| Cylinder bore, mm | 79.5 |
| Piston stroke, mm | 95.5 |
| Compression ratio | 23.0 |
| Features | SOHC |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 5.0 |
| Fuel type | diesel |
| Euro standards | EURO 1 |
| Fuel consumption, L/100 km (for Audi 100 1993) — city — highway — combined |
9.9 5.5 7.5 |
| Engine lifespan, km | ~380 000 |
The engine was installed on:
- Audi 100 C4 (4A) in 1991 – 1994.
Disadvantages of the Audi AAS engine
- This is a very reliable and durable diesel engine without a turbine and with a mechanical injection pump;
- The only weak point of the motor is the cylinder head prone to cracking;
- You also need to monitor the condition of the timing belt, since when it breaks, the valves bend;
- After 200,000 km, lubricant consumption is common, up to a liter per 1000 km;
- Even on long runs, the high-pressure fuel pump often leaks here due to the wear of its gaskets.
Frequently asked questions about the Audi AAS
How much power does the Audi AAS make?
The Audi AAS develops 82 hp and 164 Nm of torque.
How much oil does the Audi AAS take and which one?
Engine oil capacity: 5.0 liters. Recommended oil: 5W-40.
Does the Audi AAS have a timing belt or chain?
The Audi AAS uses a timing belt.
Is the Audi AAS turbocharged?
No, the Audi AAS is naturally aspirated.
Does the Audi AAS need valve clearance adjustment?
No, the Audi AAS has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Audi AAS last?
The typical lifespan of the Audi AAS is ~380 000 km with proper maintenance.
What is the fuel consumption of the Audi AAS?
Audi 100 1993: city 9.9, highway 5.5, combined 7.5 L/100 km.
What cars was the Audi AAS installed on?
Audi 100 C4 (4A) in 1991 - 1994.
What are the common problems of the Audi AAS?
This is a very reliable and durable diesel engine without a turbine and with a mechanical injection pump. The only weak point of the motor is the cylinder head prone to cracking. All known problems.
