BMC Austin/Morris 250 JU

Manual transmission fluid capacity & service interval

BMC Austin/Morris 250 JU manual transmission fluid capacity is 2,56 liters. Service intervals include checks at 5000 km or 3 months and 10000 km or 3 months, with fluid changes at 20000 km or 6 months and 20000 km or 12 months. The data covers 4 configurations.

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

TypeSpecifications
250 JU (1971-1974)
  • Use: Normal
  • Capacity 2,56 liter
  • Check 10000 km/ 3 months
  • Change 20000 km/ 6 months
  • Code: 4/1
250 JU Diesel (1971-1974)
  • Use: Normal
  • Capacity 2,56 liter
  • Check 10000 km/ 3 months
  • Change 20000 km/ 6 months
  • Code: 4/1
250 JU (1967-1971)
  • Use: Normal
  • Capacity 2,56 liter
  • Check 5000 km/ 3 months
  • Change 20000 km/ 12 months
  • Code: 4/1
250 JU Diesel (1967-1971)
  • Use: Normal
  • Capacity 2,56 liter
  • Check 5000 km/ 3 months
  • Change 20000 km/ 12 months
  • Code: 4/1

Additional Notes

  • Across all four configurations of the BMC Austin/Morris 250 JU, the manual transmission fluid capacity is 2.56 liters, a figure that applies uniformly to both petrol and diesel variants across the full 1967-1974 production span.
  • A 2.56-liter fill volume is consistent with a service fill specification, meaning the quantity expected when refilling a transmission already installed in the vehicle rather than a full bench overhaul capacity.
  • The 1967-1971 petrol variant carries a check interval of 5,000 km or 3 months under normal use conditions, paired with a fluid change interval of 20,000 km or 12 months.
  • The 1967-1971 diesel variant shares identical check and change intervals with the petrol variant of the same period, both specifying 5,000 km or 3 months for checks and 20,000 km or 12 months for changes.
  • From 1971 onward, the check interval for the petrol variant doubled from 5,000 km to 10,000 km, while the 3-month calendar limit remained unchanged, indicating a relaxed distance-based inspection schedule without altering the time-based one.
  • The 1971-1974 diesel variant mirrors the revised petrol specification exactly, with a 10,000 km or 3-month check interval and a 20,000 km or 6-month change interval under normal use conditions.
  • The change interval calendar period was halved for both petrol and diesel variants after 1971, moving from 12 months to 6 months, while the distance-based change interval of 20,000 km remained constant across all four configurations.

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