BMC Austin/Morris 250 JU
Differential fluid capacity & service interval
BMC Austin/Morris 250 JU differential fluid capacity is 1,84 liters. Service intervals include checking at 5000 km or 3 months, changing at 20000 km or 12 months, checking at 10000 km or 3 months, and changing at 20000 km or 6 months. The data covers 4 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
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Additional Notes
- The BMC Austin/Morris 250 JU carries a rear differential fluid capacity of 1.84 liters across all four configurations covered by the 1967-1974 model range, applying equally to both petrol and diesel variants.
- A 1.84-liter capacity in a rear differential of this era is consistent with a light commercial vehicle axle, where fill volume reflects a relatively compact housing designed for van-duty load ratings rather than heavy truck applications.
- For the 1967-1971 petrol variant, the check interval is set at 5,000 km or 3 months under normal use conditions, paired with a fluid change at 20,000 km or 12 months.
- The 1967-1971 Diesel variant shares the identical check and change schedule as the petrol version of the same period, with a 5,000 km or 3-month check and a 20,000 km or 12-month change interval.
- From 1971 onward, the check interval for the petrol 250 JU doubles to 10,000 km while retaining the 3-month calendar limit, indicating a relaxed distance-based inspection requirement without altering the time-based threshold.
- The 1971-1974 Diesel variant mirrors the revised petrol schedule exactly, with a 10,000 km or 3-month check and a 20,000 km or 6-month change interval under normal use conditions.
- The change interval for both the petrol and diesel 250 JU shifts from an annual 12-month cycle in the 1967-1971 period to a 6-month cycle in the 1971-1974 period, halving the maximum calendar time between fluid changes despite the distance threshold remaining at 20,000 km.
- The tightened 6-month change calendar in the post-1971 specifications means the time-based limit becomes the more frequently triggered criterion in lower-mileage operation, where 20,000 km would not be reached within half a year under typical van use patterns.