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

Engine compartment of models with a 1.8-liter 20-valve petrol engine

1. Oil filler cap
2. Air filter
3. Fuel filter
4. Upper mount of the front suspension strut
5. Brake fluid reservoir
6. Air flow sensor
7. Intake manifold
8. Oil level dipstick
9. Cooling system expansion unit
10. Power steering fluid reservoir
11. Washer fluid reservoir
12. generator
13. Guide roller
14. ABS module

Bottom view of the engine compartment of models with a 1.8-liter 20-valve petrol 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. Engine mounting lever
7. Oil pan 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

This section is intended to help the car owner maintain the car in good condition, reduce fuel and oil consumption and extend the service life of the car.

This section provides a general plan for vehicle maintenance with a detailed list of maintenance operations.

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	Models with 6-cylinder engine
Motor oil (including filter)	3.0 l	4.5 l	5.0/ 5.5 l
Cooling system	7.0 l	8.0 l	9.0 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 ADR, ABK, AAE, AAD, AAR	Champion C160
• models with engine coding ACE	Champion C149
• models with engine coding AAN, ABC, ACK	Champion
• models with engine coding AAN	Champion
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	Champion U572
– fuel filter	Fuel filter
Ignition system:
– ignition timing angle:
• aDR engine	Controlled by the engine management system
• engines AAE, ACE, AVK and AAD	6°±1° before TDC
• aAR engine	15°±1° before TDC
• aAN, AAH, ACK engine	Controlled by the engine management system
• aBC engine	7°–27° BTDC
Spark plugs:
– models with engine coding ADR, ABK, AAD, AAR	Champion N7BYC
– models with ACE engine coding	Champion C6BYC
– models with engine coding AAE	NGK BUR6ET
– models with engine coding AAN	Bosch F5DPOR
– models with engine coding ABC, AAH, ACK	NGK BKUR6ET-10
Spark plug gap:
All models	0.8 mm
Brake system:
– minimum allowable thickness of friction material front brake pads	2.0 mm
– minimum permissible thickness of brake linings rear brakes	7 mm
– minimum allowable thickness of friction material rear brake pads	2.5 mm
Drive belt:
– deviation:
• new drive belt generator	2.0 mm
• alternator drive belt, formerly in service	5.0 mm
• pump drive belt power steering systems	10.0 mm
• compressor drive belt air conditioner	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
Fill hole/ level check plug manual transmission oils:
– gearbox 012	25
– gearbox 01E	40
Fastening the pump of the power steering system	25
Wheel mounting bolts	110
Spark plugs:
– models with engine coding ADR, AAE, ABK	30
– models with engine coding ACE, AAD, AAR	20
– models with engine coding AAN	20
– models with engine coding ABC, AAH, ACK	30
Oil pan drain plug	30