McCormick G-Max

Coolant capacity & service interval

McCormick G-Max coolant capacity is 29 liters. Service intervals are 2000 hours or 24 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)
  • Use: Normal
  • Capacity 29 liter
  • Change 2000 hours/ 24 months
G135 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Use: Normal
  • Capacity 29 liter
  • Change 2000 hours/ 24 months
G145 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Use: Normal
  • Capacity 29 liter
  • Change 2000 hours/ 24 months
G165 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Use: Normal
  • Capacity 29 liter
  • Change 2000 hours/ 24 months
G180 MAX, FPT NEF 6.7 (T3) (2007-2014)
  • Use: Normal
  • Capacity 29 liter
  • Change 2000 hours/ 24 months

Additional Notes

  • The McCormick G-Max cooling system capacity is listed at 29 liters across all five variants — the G125 MAX, G135 MAX, G145 MAX, G165 MAX, and G180 MAX — each fitted with the FPT NEF 6.7 Tier 3 engine. A 29-liter figure represents a substantial total system volume, consistent with the radiator, engine block, cylinder head passages, and associated hoses all being included in a full service fill.
  • The 29-liter capacity is uniform across the entire G-Max range from 2007-2014, meaning no variation in cooling system volume exists between the lower-output G125 MAX and the higher-output G180 MAX despite their differing power ratings. A shared engine platform — the FPT NEF 6.7 — accounts for the consistent capacity figure.
  • The coolant change interval for all five variants is specified at 2000 hours or 24 months under normal use conditions, whichever comes first. In agricultural equipment, a dual-trigger interval like this accounts for machines that may accumulate hours slowly, ensuring time-based degradation of coolant additives is also addressed.
  • A 2000-hour service interval for coolant is a moderately extended interval, reflecting the use of a long-life or extended-service coolant formulation rather than a conventional short-life antifreeze, which typically requires changes at shorter intervals.
  • All five rows carry a normal use condition designation, meaning the 2000-hour/24-month interval applies to standard operating environments. No separate severe-use interval is listed for any of the G-Max variants in the specifications.

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