McCormick G-Max

Differential fluid capacity & service interval

McCormick G-Max differential fluid capacity ranges from 6 to 11 liters. Fluid change intervals occur every 1000 hours or 12 months. The data covers 5 configurations.

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

TypeSpecifications
  • G125 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Front
  • Use: Normal
  • Capacity 10 liter
  • Change 1000 hours/ 12 months
  • Code: (4x4)
  • G135 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Front
  • Use: Normal
  • Capacity 10 liter
  • Change 1000 hours/ 12 months
  • Code: (4x4)
  • G145 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Front
  • Use: Normal
  • Capacity 11 liter (with central brakes)
  • Capacity 6 liter (with side brakes)
  • Change 1000 hours/ 12 months
  • Code: (4x4)
  • G165 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Front
  • Use: Normal
  • Capacity 6 liter
  • Change 1000 hours/ 12 months
  • Code: (4x4)
  • G180 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Front
  • Use: Normal
  • Capacity 6 liter
  • Change 1000 hours/ 12 months
  • Code: (4x4)

Additional Notes

  • The McCormick G-Max front differential fluid capacity across the G125 MAX and G135 MAX variants is 10 liters, a figure consistent with a standard service fill for a front axle differential of this class.
  • The G145 MAX stands apart from all other variants in the lineup by carrying two distinct front differential capacities depending on brake configuration: 11 liters with central brakes and 6 liters with side brakes, representing a difference of 5 liters between the two setups.
  • The 11-liter capacity specified for the G145 MAX with central brakes is the largest front differential fill volume across all five variants, reflecting the additional fluid volume required to service the integrated braking hardware within the differential housing.
  • The G165 MAX and G180 MAX share an identical front differential capacity of 6 liters, matching the lower of the two G145 MAX configurations.
  • All five variants share a uniform service interval of 1000 hours or 12 months under normal use conditions, whichever comes first, applying equally regardless of the capacity differences between configurations.
  • The dual-threshold interval structure of 1000 hours and 12 months means that calendar time can trigger a fluid change before the hour meter reaches the operational threshold, particularly relevant for equipment used in lower-intensity seasonal applications.

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