Bentley Mark IV

Manual transmission fluid capacity & service interval

Bentley Mark IV manual transmission fluid capacity is 3,4 liters. Service intervals include a check at 8000 km and a change at 32000 km. The data covers 2 configurations.

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

TypeSpecifications
Mark IV 4½-litre (1951-1953)
  • Use: Normal
  • Capacity 3,4 liter
  • Check 8000 km
  • Change 32000 km
  • Code: 4/1
Mark IV 4¼-litre (1946-1951)
  • Use: Normal
  • Capacity 3,4 liter
  • Check 8000 km
  • Change 32000 km
  • Code: 4/1

Additional Notes

  • Both the 4¼-litre and 4½-litre variants of the Bentley Mark IV share an identical manual transmission fluid capacity of 3.4 liters, which represents a service fill volume typical of a complete fluid replacement rather than a partial top-up.
  • The 8,000 km check interval applies to normal use conditions across both engine variants, meaning the fluid level is inspected at that mileage point without necessarily being replaced.
  • Under normal use conditions, the change interval for manual transmission fluid is set at 32,000 km for both the 4¼-litre and 4½-litre configurations, a figure that reflects a relatively extended drain period consistent with mid-20th century service practices for manual gearboxes.
  • The 4¼-litre engine was fitted to the Mark IV from 1946-1951, while the 4½-litre engine covered 1951-1953, yet the transmission fluid specifications remained unchanged between the two engine displacements.
  • The ratio between the check interval and the change interval is exactly 1:4, meaning four fluid level inspections occur for every one full fluid change under the normal use schedule.

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