Glas Isar

Manual transmission fluid capacity & service interval

Glas Isar manual transmission fluid capacity is 1,25 liters. Service intervals include checking at 2500 km and 6000 km, and changing at 10000 km and 24000 km. The data covers 2 configurations.

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

TypeSpecifications
Isar T600 (1958-1965)
  • Use: Normal
  • Capacity 1,25 liter
  • Check 2500 km
  • Change 10000 km
  • Code: 4/1
Isar T700 (1958-1965)
  • Use: Normal
  • Capacity 1,25 liter
  • Check 6000 km
  • Change 24000 km
  • Code: 4/1

Additional Notes

  • The Glas Isar T600 and T700 share an identical manual transmission fluid capacity of 1.25 liters, which is a relatively modest fill volume consistent with the compact gearboxes found in small economy cars of the late 1950s and early 1960s.
  • Despite the shared capacity figure, the two variants carry meaningfully different service intervals. The T600 specifies a fluid check every 2,500 km and a full change every 10,000 km, while the T700 extends those intervals to a check every 6,000 km and a change every 24,000 km.
  • The T700 change interval of 24,000 km is 2.4 times longer than the 10,000 km interval specified for the T600, a substantial divergence between two models sharing the same production years of 1958-1965.
  • Both rows carry a normal use condition designation, meaning neither interval set reflects a severe-duty or first-fill scenario. The difference in intervals between the T600 and T700 therefore reflects a distinction in engineering specification rather than a difference in operating environment assumptions.
  • The T600 check interval of 2,500 km places fluid monitoring on a relatively frequent schedule by mid-20th century standards, suggesting a closer attention to transmission condition was considered appropriate for that variant.

Other Systems