View of the engine compartment and filling volumes (Audi A6 C4)

Engine bay of models with 1.9L turbocharged 4-cylinder diesel engine

1. Oil filler cap
2. Air flow sensor
3. air filter
4. Exhaust gas recirculation valve
5. Upper mount of the front suspension strut
6. Brake fluid reservoir
7. Air pipe from turbochargers
8. Fuel filter
9. Expansion tank of the cooling system
10. Power steering fluid reservoir
11. Washer fluid reservoir
12. ABS module
13. Oil level dipstick
14. Water pump
15. Generator

Bottom view of the engine compartment of models with a 1.9L turbocharged diesel 4-cylinder engine

1. Exhaust system inlet pipe
2. Lower arm of the front suspension
3. Front suspension anti-roll bar
4. Brake caliper
5. Horns
6. Intercooler
7. Engine mounting lever
8. Generator
9. Oil pan drain plug
10. Power steering pump
11. Half shaft
12. Manual transmission
13. Oil filter

Engine compartment of models with a 2.5L 5-cylinder diesel engine

1. Oil filler cap
2. Intake manifold
3. Air flow sensor and air filter
4. Exhaust gas recirculation valve
5. Vacuum chamber
6. Upper mount of the front suspension strut
7. Brake fluid reservoir
8. Injection pump drive belt
9. Injection pump
10. Oil level dipstick
11. Battery
12. Expansion tank of the cooling system
13. Power steering fluid reservoir
14. Washer fluid reservoir
15. ABS module
16. Power steering pump

Bottom view of the engine compartment of models with a 2.5L 5-cylinder diesel engine

1. Exhaust system inlet pipe
2. Lower arm of the front suspension
3. Anti-roll bar
4. Brake caliper
5. Horns
6. Intercooler
7. Engine mounting lever
8. Oil filter
9. Oil pan drain plug
10. Power steering pump
11. Half shaft
12. Manual transmission drain plug

Bottom view of the rear of the body

1. Intermediate muffler
2. Rear suspension trailing arm
3. Handbrake cable
4. Rear suspension strut and spring
5. Rear axle
6. Transverse thrust
7. Fuel tank
8. Exhaust pipe and muffler

Carrying out maintenance according to the maintenance schedule provided will ensure long and reliable service of the vehicle. This maintenance schedule is complete, so it is recommended that all maintenance operations be carried out at the specified times.

When servicing a vehicle, you will notice that some operations can be combined with other operations - this follows from the nature of the maintenance operations themselves. For example, if you lift the vehicle to perform an operation, the exhaust system components can be checked at the same time as the suspension or steering components.

Before you start working, you need to prepare for maintenance. Read the entire description of the operation you are going to perform and purchase the necessary tools and spare parts. If you encounter a serious problem, contact a specialist.

	Volumes
	Models with 4-cylinder engine	Models with 5-cylinder engine
Motor oil (including filter)	3.0 l	5.0 l

Cooling system:
- all models	6.5 l
Transmission:
- manual transmission	2.4 l
– automatic transmission:
• total volume	5.5 l
• fluid replacement	3.5 l
• main gear automatic gearboxes	1.0 l
Power steering system:
– models with automatically adjustable rear suspension	2.5 l
- models with conventional rear suspension	1.1 l
Fuel tank:
- all models (approximately)	80 l
Engine:
– oil filter:
• models with engine coding 1Z AHU	Champion C150
• models with engine coding AAT (a6 models with manual transmission)	Champion C150
• models with engine coding ABP, AAT (up to Audi models 100 VIN 4A-N-250-000	Champion C 150
• models with engine coding AAT (a6 models with manual transmission), AEL	Champion C 152
• models with engine coding AEL, AAS	Champion C 152
• models with aAT engine coder (starting with Audi models 100 VIN 4A-P-000-001)	Champion C 112
Cooling system:
– antifreeze content:
• 40% antifreeze content	Protection up to -25°C
• 50% antifreeze content	Protection up to -35°C
Power supply system:
– air filter:
• models with engine coding 1Z, AHU	Champion U 572
• all other models	Champion U 633
– fuel filter:
• models with engine coding 1Z, AHU, ABP, AAT (A6 models), AEL	Champion L 114
• models with aAT engine coding (audi 100 models)	Champion L 118
• models with engine coding AAS	Champion L 117
Brake system:
– minimum permissible thickness of brake linings	2.0 mm
– minimum permissible thickness of friction material brake pads	2.5 mm
– minimum permissible thickness of friction material rear brake pads	2.5 mm
Drive belt:
V-belt drive deviation (1Z and AHU engines)	5.0 mm

Tightening torques, Nm

Generator mounting bolt	35
Generator tensioner mount	20
Generator tensioner mounting nut	35
Automatic transmission filler pipe fastening nut (097)	80
Fill hole/ level check plug automatic transmission fluids	25
Automatic transmission inspection hole plug (01N)	15
Automatic transmission bypass pipe (01N)	2
Fuel filter mounting bolt (5-cylinder engine)	25
Fill hole/ level check plug manual transmission oils:
– gearbox 012	25
– gearbox 01E	40
Fastening the pump of the power steering system management	25
Wheel mounting bolts	110
Oil pan drain plug	30