Holden Monaro, HQ

Differential fluid capacity & service interval

Holden Monaro, HQ differential fluid capacity is 1,42 liters. Service intervals occur every 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
  • Monaro V8 GTS, HQ 253 LC (1971-1974)
  • Rear
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months
  • Monaro V8 GTS, HQ 253 LC (1971-1974)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months
  • Monaro V8 GTS, HQ 253 HC (1971-1974)
  • Rear
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months
  • Monaro V8 GTS, HQ 253 HC (1971-1974)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months
  • Monaro V8 GTS, HQ 308 HC (1971-1974)
  • Rear
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months
  • Monaro V8 GTS, HQ 308 HC (1971-1974)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months
  • Monaro V8 GTS 350, HQ 350 HC (1971-1974)
  • Rear
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months
  • Monaro V8 GTS 350, HQ 350 HC (1971-1974)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,42 liter
  • Check 10000 km/ 6 months

Additional Notes

  • Across all listed configurations of the Holden Monaro HQ for 1971-1974, the rear differential fluid capacity is 1.42 liters, applying equally to the 253 LC, 253 HC, 308 HC, and 350 HC engine variants.
  • The 1.42-liter figure represents a service fill capacity, meaning the volume required when refilling a differential already installed in the vehicle rather than a fully drained overhaul quantity.
  • A check interval of every 10,000 km or 6 months, whichever comes first, is specified under normal use conditions for all rear differential configurations across the 1971-1974 range.
  • The dual interval structure of 10,000 km and 6 months means fluid condition is assessed on a time basis even when distance accumulation is low, which is relevant for vehicles covering shorter annual mileage.
  • Both standard rear differential and limited slip differential variants share an identical 1.42-liter capacity across all engine configurations, indicating no capacity difference between the two differential types in the Holden Monaro HQ.
  • The limited slip differential variant is listed separately from the standard rear differential for each engine configuration, reflecting a distinction in differential type while retaining the same fluid volume and check interval specifications.
  • No variation in capacity or check interval exists between the 253 LC and 253 HC compression variants, with both sharing the 1.42-liter fill and the 10,000 km or 6-month service check.

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