Mercedes-Benz T-Class, W420 (EU)

Additional Notes

• The Mercedes-Benz T-Class W420 (EU) carries a 4-liter initial fill capacity across all three listed variants — the T 160 d (420.823), T 180 d (420.833), and T 180 (420.863).
• Initial fill refers to the total fluid volume required when the transmission is dry, such as after a complete overhaul or unit replacement, making the 4-liter figure relevant to full assembly situations.
• The service fill capacity is 3.5 liters under normal use conditions for all three variants, reflecting the reduced volume needed when residual fluid remains in the torque converter or transmission passages during a routine fluid change.
• The 0.5-liter difference between the 4-liter initial fill and the 3.5-liter service fill is consistent across the T 160 d, T 180 d, and T 180, indicating a uniform transmission architecture among these variants.
• All three variants are noted as transaxle, semi-automatic units, meaning the transmission and drive axle share a common housing — a configuration that can influence fluid drainage completeness and, by extension, the relevance of the service fill versus initial fill distinction.
• The capacity specifications apply under normal use conditions, which is the sole use condition listed for all three variants in the automatic transmission fluid system.
• The T 160 d and T 180 d are diesel-engined variants, while the T 180 is a petrol variant, yet all three share identical automatic transmission fluid capacities, pointing to a shared transmission unit across the powertrain lineup.