Bentley 3½/4¼ litre

Manual transmission fluid capacity & service interval

Bentley 3½/4¼ litre requires manual transmission fluid with a capacity of 2,56 liters. The data covers 2 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
4¼ litre, G -> M (1936-1941)
  • Use: Normal
  • Capacity 2,56 liter
  • Code: 4/1
3½ litre (1933-1937)
  • Use: Normal
  • Capacity 2,56 liter
  • Code: 4/1

Additional Notes

  • The Bentley 3½/4¼ litre manual transmission holds 2.56 liters of fluid, a capacity figure that reflects a service fill level rather than a full overhaul or dry-fill quantity, which would typically be higher to account for residual fluid in passages and the torque converter or clutch housing.
  • The 3½ litre variant, produced from 1933-1937, shares an identical 2.56-liter manual transmission fluid capacity with the 4¼ litre G-through-M series produced from 1936-1941, indicating a common gearbox architecture carried across both engine displacements.
  • Both configurations list fluid capacity under normal use conditions, meaning the 2.56-liter figure applies to standard operating environments rather than severe-duty cycles such as towing, sustained high-load driving, or extreme temperature exposure.
  • The 4¼ litre series is identified by chassis code designations G through M, a sequential lettering system Bentley used during the pre-war period to distinguish production series within a single model line rather than by calendar year alone.

Other Systems