Capacities For AUDI A6 (4B_) From My 1998 And AUDI ALLROAD Through My 2005

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.

Features of the refrigerant system:

Restrictor
Reservoir
"Denso" or "Zexel / Valeo" A/C compressors with A/C Clutch -N25-. Refer to Refrigerant Circuit (vehicle-specific service information) and to the Parts Information.

Vehicle type	Production period	Total quantity of oil in refrigerant circuit in cm³	Quantity of refrigerant oil in replacement compressor in cm³	Differing features of this refrigerant circuit
Audi A6/Audi allroad 4-cylinder gasoline engine except 2.0L 6-cylinder gasoline engine except 3.0L	From 04/1997 all	250 + 50	250 + 50	See notes below
Audi A6/Audi allroad 4-cylinder diesel engine 6-cylinder diesel engine (see notes for Audi Allroad)	From 04/1997 to 05/2001	250 + 50	250 + 50	See notes below
Audi A6 8-cylinder engine (with chain-driven camshaft)	From 04/1997 all	250 + 50	250 + 50	See notes below

NOTE:

The replacement compressor contains the full quantity of oil intended for the refrigerant circuit. If the A/C compressor is being replaced, the quantity of oil in the A/C compressor must be adjusted. Refer to Refer to REFRIGERANT CIRCUIT COMPONENTS, REPLACING .

The Audi A6 are equipped with different A/C compressors depending on engine and vehicle date of manufacture.

From MY 2002, the Audi A6 features compressors with A/C clutch or regulator valve (different oil quantities) depending on the engine. For the Audi allroad with 6-cylinder diesel engine, the change over began in MY 2003. Refer to Refrigerant Circuit (vehicle-specific service information) and Parts Information.

Beginning from production year 2006, the name of the "Zexel" A/C compressor was changed from "Zexel" to "Valeo".

Features of the refrigerant system:

Restrictor
Reservoir
"Denso" A/C compressor with A/C Compressor Regulator Valve -N280-. Refer to Refrigerant Circuit (vehicle-specific service information) and the Parts Information.

Vehicle type	Production period	Total quantity of oil in refrigerant circuit in cm³	Quantity of refrigerant oil in replacement compressor in cm³	Differing features of this refrigerant circuit
Audi A6 4-cylinder gasoline engine 2.0L 6-cylinder gasoline engine 3.0L	All	220 + 20	220 + 20	A/C compressor type "6 SEU 12" or "7 SEU 16" (see notes below)
Audi A6/Audi allroad 4-cylinder diesel engine 6-cylinder diesel engine (see notes for Audi Allroad)	From 05/2001	245 + 20	245 + 20	A/C compressor type "6 SEU 12" or "7 SEU 16" (see notes below)
Audi allroad 8-cylinder engine (with chain-driven camshaft)	All	220 + 20	220 + 20	A/C compressor type "7 SEU 17" (see notes below)

NOTE:

The Audi A6 are equipped with different A/C compressors depending on engine and vehicle date of manufacture.

From MY 2002, the Audi A6 features compressors with A/C clutch or regulator valve (different oil quantities) depending on the engine. For the Audi Allroad with 6-cylinder diesel engine, the change occurred gradually in MY 2003.

The A/C compressor with an A/C Compressor Regulator Valve -N280- is available as a replacement part with different oil capacities, therefore pay attention to the exact part number. Refer to Refrigerant Circuit (vehicle-specific service information) and to the Parts Information.

The reason for the different oil capacities inside the A/C compressor is due to the design of the A/C compressor (with or without an oil separator on the high pressure connection) or to the design of the refrigerant circuit if the A/C compressors are have the identical design. Pay attention to the different capacities. Too much oil in the circuit leads to higher pressures and reduces cooling output of the system. Too little oil may lead to lubrication problems in the compressor.

A data plate may be attached to the A/C compressor by the manufacturer, indicating the part number and refrigerant oil quantity.