Opel Diplomat A

Manual transmission fluid capacity & service interval

Opel Diplomat A manual transmission fluid capacity is 1,1 liters. Service intervals include checks every 10000 km or 6 months. The data covers 3 configurations.

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

TypeSpecifications
Diplomat A 2.6 (1964-1968)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 10000 km
  • Code: 4/1
Diplomat A 2.8 (1964-1968)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 10000 km
  • Code: 4/1
Diplomat A 2.8 HL (1964-1968)
  • Use: Normal
  • Capacity 1,1 liter
  • Check 10000 km/ 6 months
  • Code: 4/1

Additional Notes

  • The Opel Diplomat A manual transmission fluid capacity is 1.1 liters across the 2.6, 2.8, and 2.8 HL variants for the 1964-1968 model years.
  • A 1.1-liter figure for a manual transmission is consistent with a service fill, meaning the amount of fluid needed when topping up or refilling during routine maintenance rather than a full overhaul capacity.
  • The 2.6 and 2.8 variants share an identical service interval of 10,000 km under normal use conditions, with no time-based component attached to that interval.
  • The 2.8 HL introduces a dual-condition service interval of 10,000 km or 6 months under normal use, whichever comes first, distinguishing it from the other two variants despite sharing the same 1.1-liter capacity.
  • The addition of a 6-month time limit on the 2.8 HL interval means fluid condition is treated as time-dependent in that variant, not solely mileage-dependent as in the 2.6 and 2.8.
  • All three variants are specified under normal use conditions, meaning the listed intervals and capacities apply to standard operating circumstances rather than severe or demanding service cycles.

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