MG Midget

Differential fluid capacity & service interval

MG Midget differential fluid capacity ranges from 0,8 to 1 liter. Service intervals include 6000 miles, 9600 km, 10000 km, or 6 months. The data covers 8 configurations.

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

TypeSpecifications
  • Midget MK III 1500 (1977-1979)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 km/ 6 months
  • Midget MK III 1500 (1977-1979)
  • Rear
  • Use: top up
  • Capacity 1 liter
  • Check 10000 km/ 6 months
  • Midget MK III 1500 (1974-1977)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 km/ 6 months
  • Midget MK III 1500 (1974-1977)
  • Rear
  • Use: top up
  • Capacity 1 liter
  • Check 10000 km/ 6 months
  • Midget MK III (1970-1974)
  • Rear
  • Use: Normal
  • Capacity 1 liter
  • Check 6000 miles/ 6 months
  • Midget MK III (1966-1969)
  • Rear
  • Use: Normal
  • Capacity 0,8 liter
  • Check 6000 miles/ 9600 km
  • Midget MK II 1100 (1963-1966)
  • Rear
  • Use: Normal
  • Capacity 0,85 liter
  • Change 6000 miles/ 9600 km
  • Midget MK I (1962-1963)
  • Rear
  • Use: Normal
  • Capacity 0,85 liter
  • Change 6000 miles/ 9600 km

Additional Notes

  • The MG Midget MK I and MK II 1100 share an identical rear differential fluid capacity of 0.85 liter, with a change interval of 6,000 miles (9,600 km) under normal use conditions.
  • The MK III introduced in 1966 carries a slightly reduced rear differential capacity of 0.8 liter compared to the earlier marks, and the service action shifts from a fluid change to a check at the same 6,000-mile (9,600 km) interval.
  • From 1970, the MK III rear differential capacity increases to 1 liter, a figure that remains consistent across all subsequent variants through 1979. A check interval of 6,000 miles or 6 months applies to the 1970-1974 variant, whichever comes first.
  • The 1970-1974 MK III is the only variant in the range where the check interval is expressed in miles alongside a 6-month time limit, combining a distance and a calendar trigger for the same service action.
  • Starting with the MK III 1500 from 1974, the distance-based check interval is expressed exclusively in kilometers at 10,000 km, paired with a 6-month time condition, replacing the miles-based intervals used in earlier marks.
  • The MK III 1500 variants covering 1974-1977 and 1977-1979 each carry two separate entries for the rear differential: one for normal use and one for top-up. Both entries share the same 1-liter capacity figure and the same 10,000 km or 6-month check interval.
  • The presence of a dedicated top-up entry alongside the normal use entry in the MK III 1500 specifications indicates that the 1-liter figure serves as a reference for both full-level assessment and partial replenishment scenarios, rather than a single-context fill value.
  • Across the full 1962-1979 span of the MG Midget, rear differential capacity ranges from 0.8 liter at its lowest to 1 liter at its highest, with the increase occurring between the early and later MK III production periods.

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