Isuzu NKR

Differential fluid capacity & service interval

Isuzu NKR differential fluid capacity ranges from 2,7 to 3 liters. Service intervals include checking at 10000 km and changing at 20000 km or 12 months and 40000 km or 24 months. The data covers 14 configurations.

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

TypeSpecifications
  • NKR 35 (1998-2007)
  • Rear, hypoid
  • Use: Normal
  • Capacity 2,7 liter
  • Check 10000 km
  • Change 40000 km/ 24 months
  • Code: 320
  • NKR 35 (1998-2007)
  • Rear, hypoid
  • Use: Severe
  • Capacity 2,7 liter
  • Change 20000 km/ 12 months
  • Code: 320
  • NKR 55 (1996-2007)
  • Rear, hypoid
  • Use: Normal
  • Capacity 2,7 liter
  • Check 10000 km
  • Change 40000 km/ 24 months
  • Code: NKR 55 E
  • NKR 55 (1996-2007)
  • Rear, hypoid
  • Use: Severe
  • Capacity 2,7 liter
  • Change 20000 km/ 12 months
  • Code: NKR 55 E
  • NKR 55 (1996-2007)
  • Rear, hypoid
  • Use: Normal
  • Capacity 3 liter
  • Check 10000 km
  • Change 40000 km/ 24 months
  • Code: NKR 55 E2/L
  • NKR 55 (1996-2007)
  • Rear, hypoid
  • Use: Severe
  • Capacity 3 liter
  • Change 20000 km/ 12 months
  • Code: NKR 55 E2/L
  • NKR 58 (1996-2007)
  • Rear, hypoid
  • Use: Normal
  • Capacity 3 liter
  • Check 10000 km
  • Change 40000 km/ 24 months
  • Code: NKR 58 E2/ED
  • NKR 58 (1996-2007)
  • Rear, hypoid
  • Use: Severe
  • Capacity 3 liter
  • Change 20000 km/ 12 months
  • Code: NKR 58 E2/ED
  • NKR 66 (1996-2007)
  • Rear, hypoid
  • Use: Normal
  • Capacity 3 liter
  • Check 10000 km
  • Change 40000 km/ 24 months
  • Code: NKR 66 L
  • NKR 66 (1996-2007)
  • Rear, hypoid
  • Use: Severe
  • Capacity 3 liter
  • Change 20000 km/ 12 months
  • Code: NKR 66 L
  • NKR 69 (1996-2007)
  • Rear, hypoid
  • Use: Normal
  • Capacity 2,7 liter
  • Check 10000 km
  • Change 40000 km/ 24 months
  • Code: NKR 69 E
  • NKR 69 (1996-2007)
  • Rear, hypoid
  • Use: Severe
  • Capacity 2,7 liter
  • Change 20000 km/ 12 months
  • Code: NKR 69 E
  • NKR 69 (1996-2007)
  • Rear, hypoid
  • Use: Normal
  • Capacity 3 liter
  • Check 10000 km
  • Change 40000 km/ 24 months
  • Code: NKR 69 L
  • NKR 69 (1996-2007)
  • Rear, hypoid
  • Use: Severe
  • Capacity 3 liter
  • Change 20000 km/ 12 months
  • Code: NKR 69 L

Additional Notes

  • The Isuzu NKR rear differential is a hypoid type across all listed variants, spanning the NKR 35, NKR 55, NKR 58, NKR 66, and NKR 69 configurations. Hypoid differentials use a gear set where the pinion axis is offset from the ring gear centerline, a design that requires dedicated gear oil with extreme-pressure additives to handle the sliding contact loads generated during operation.
  • Two distinct fluid capacities appear across the NKR range: 2.7 liters and 3.0 liters. The 2.7-liter figure applies to the NKR 35 and to certain configurations of the NKR 55 and NKR 69, while the 3.0-liter figure applies to the NKR 58, NKR 66, and to additional configurations of the NKR 55 and NKR 69. The difference of 0.3 liters reflects variation in differential housing size between configurations rather than a service fill versus overhaul distinction, as both values are listed as standard fill capacities.
  • The NKR 55 and NKR 69 each carry two separate capacity entries — one at 2.7 liters and one at 3.0 liters — indicating that multiple differential assemblies were fitted to those variants depending on the specific build or axle specification.
  • Under normal use conditions, all listed NKR variants share a fluid check interval of every 10,000 km. A periodic check interval shorter than the change interval is standard practice for differentials, allowing fluid level and condition to be monitored without a full drain-and-fill service at each visit.
  • The normal-use fluid change interval across all NKR variants is 40,000 km or 24 months, whichever comes first. The dual-trigger format — combining a distance threshold with a time limit — accounts for vehicles that accumulate low mileage over extended periods, during which fluid degradation can still occur through moisture absorption and oxidation.
  • Under severe use conditions, the change interval for all listed NKR variants is halved to 20,000 km or 12 months. No fluid check interval is listed for severe use, which is consistent with the expectation that more frequent changes reduce the need for intermediate inspections.
  • The NKR 35 specifications begin from 1998, while the NKR 55, NKR 58, NKR 66, and NKR 69 all carry specifications from 1996. Despite the different start years, all variants share the same 1996-2007 overall range for the differential fluid system, with the NKR 35 simply entering the lineup two years later.

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