Audi A4, S4, RS 4, 8E (EU)

Additional Notes

• All six configurations listed carry a transfer case fluid capacity of 0.5 liter, which is a small volume consistent with a compact transfer box rather than a larger, gear-driven unit requiring a higher fill quantity.
• Each row is noted as "transferbox, from automatic," meaning the 0.5 liter capacity figure applies specifically to vehicles equipped with an automatic transmission, where the transfer case is driven off the automatic gearbox rather than a manual unit.
• All listed configurations are designated for normal use conditions, meaning the stated 0.5 liter capacity is associated with standard operating environments rather than severe-duty cycles.
• The Audi A4 2.0 TFSI quattro (147 kW) and the 3.0 TDI V6 quattro (150 kW) DPF share the same 2004-2008 production window and the same 0.5 liter transfer case capacity, despite the significant difference in engine displacement and fuel type between a turbocharged four-cylinder petrol and a six-cylinder diesel.
• The A4 3.0 TDI V6 quattro (171 kW) DPF has a narrower model year range of 2006-2008 compared to the 150 kW DPF variant, yet the transfer case fluid capacity remains at 0.5 liter, indicating the higher-output diesel variant uses the same transfer box specification.
• The A4 3.0 V6 quattro (160 kW) covers only 2004-2006, the shortest production window among the A4 petrol variants listed, while still sharing the 0.5 liter transfer case fill capacity common across the range.
• The S4 4.2 V8 quattro spans 2003-2008, the widest year range among all listed configurations, and despite the substantially larger engine displacement relative to the A4 variants, the transfer case fluid capacity is identically specified at 0.5 liter.