Buick Regal, GM10 (USA / CAN)

Coolant capacity & service interval

Buick Regal, GM10 (USA / CAN) uses coolant with a capacity of 11 liters. Service intervals include checking every 12 months and changing every 240000 km or 60 months. The data covers 4 configurations.

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

TypeSpecifications
Regal 3.8 V6 (2003-2004)
  • Use: Normal
  • Capacity 11 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Regal 3.8 V6 Supercharged (2003-2004)
  • Use: Normal
  • Capacity 11 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Regal 3.8 V6 (1997-2003)
  • Use: Normal
  • Capacity 11 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Regal 3.8 V6 Supercharged (1997-2003)
  • Use: Normal
  • Capacity 11 liter
  • Check 12 months
  • Change 240000 km/ 60 months

Additional Notes

  • The Buick Regal GM10 cooling system holds 11 liters across all listed configurations, which is a typical service fill capacity for a V6-powered mid-size sedan of the era.
  • The 11-liter capacity applies equally to both the naturally aspirated 3.8 V6 and the supercharged 3.8 V6 variants, spanning the 1997-2004 model range without variation between the two engine types.
  • A coolant check interval of 12 months is specified under normal use conditions for all four configurations, meaning the system is inspected annually regardless of mileage accumulation.
  • The coolant change interval is set at 240,000 km or 60 months under normal use, whichever comes first. The 60-month figure translates to a five-year replacement cycle based on time alone.
  • The 240,000 km distance threshold is notably high and is consistent with long-life coolant formulations, such as DEX-COOL, which General Motors introduced during the mid-1990s for extended drain intervals.
  • The 1997-2003 and 2003-2004 row entries for both the naturally aspirated and supercharged 3.8 V6 share identical capacity and interval specifications, indicating no change in cooling system requirements across the mid-production update reflected by the overlapping 2003 model year.

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