Borgward Isabella

Differential fluid capacity & service interval

Borgward Isabella differential fluid capacity ranges from 1,5 to 1,75 liters. Service intervals include checks at 4000 km and changes at 12000 km. The data covers 5 configurations.

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

TypeSpecifications
  • Isabella 1500 Combi (1957-1962)
  • Rear
  • Use: Normal
  • Capacity 1,75 liter (Dry fill)
  • Capacity 1,5 liter (Service fill)
  • Check 4000 km
  • Change 12000 km
  • Isabella 1500 CoupĂ© / Cabrio (1957-1962)
  • Rear
  • Use: Normal
  • Capacity 1,75 liter (Dry fill)
  • Capacity 1,5 liter (Service fill)
  • Check 4000 km
  • Change 12000 km
  • Isabella 1500 Standard (1957-1962)
  • Rear
  • Use: Normal
  • Capacity 1,75 liter (Dry fill)
  • Capacity 1,5 liter (Service fill)
  • Check 4000 km
  • Change 12000 km
  • Isabella 1500 TS (1957-1962)
  • Rear
  • Use: Normal
  • Capacity 1,75 liter (Dry fill)
  • Capacity 1,5 liter (Service fill)
  • Check 4000 km
  • Change 12000 km
  • Isabella 1500 TS de Luxe (1957-1962)
  • Rear
  • Use: Normal
  • Capacity 1,75 liter (Dry fill)
  • Capacity 1,5 liter (Service fill)
  • Check 4000 km
  • Change 12000 km

Additional Notes

  • The Borgward Isabella rear differential carries a dry fill capacity of 1.75 liters, which represents the total volume required when filling a completely drained or rebuilt unit from empty.
  • The service fill capacity across all five Isabella 1500 variants sits at 1.5 liters, reflecting the smaller volume needed during a routine fluid change where residual fluid remains in the housing.
  • The 0.25-liter difference between dry fill and service fill capacities indicates that a portion of fluid is retained in the differential housing even after a standard drain, a common characteristic of rear axle differentials with non-pressurized drain procedures.
  • All five variants, the Combi, CoupĂ©/Cabrio, Standard, TS, and TS de Luxe, share identical rear differential capacity figures for the 1957-1962 model years, pointing to a common rear axle assembly across the Isabella 1500 lineup.
  • The check interval for the rear differential fluid is specified at 4,000 km under normal use conditions, a relatively short inspection cycle consistent with maintenance practices common to vehicles of the late 1950s and early 1960s.
  • The change interval is set at 12,000 km under normal use conditions, meaning a full fluid replacement is called for every three check cycles.

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