Buick LaCrosse, P2XX (USA / CAN)

Coolant capacity & service interval

Buick LaCrosse, P2XX (USA / CAN) coolant capacity is 9 liters. Service intervals occur at 150000 miles 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
LaCrosse 2.5 (2018-2020)
  • Use: Normal
  • Capacity 9 liter
  • Change 150000 miles/ 60 months
LaCrosse 3.6L V6 VVT (2018-2020)
  • Use: Normal
  • Capacity 9 liter
  • Change 150000 miles/ 60 months
LaCrosse 3.6L V6 VVT AWD (2018-2020)
  • Use: Normal
  • Capacity 9 liter
  • Change 150000 miles/ 60 months
LaCrosse 3.6L V6 VVT (2017-2017)
  • Use: Normal
  • Capacity 9 liter
  • Change 150000 miles/ 60 months

Additional Notes

  • The Buick LaCrosse P2XX cooling system capacity is 9 liters across all listed engine configurations, a figure consistent with a full cooling system service fill rather than a partial top-off or overflow reservoir measurement.
  • The 9-liter capacity applies equally to the 2.5-liter four-cylinder and the 3.6L V6 VVT variants, meaning neither engine displacement nor cylinder count produces a difference in total coolant volume for the 2018-2020 model years.
  • Adding all-wheel drive to the 3.6L V6 VVT configuration, as seen in the 2018-2020 AWD variant, does not alter the 9-liter cooling system capacity relative to the front-wheel-drive version of the same engine.
  • The 3.6L V6 VVT in the 2017 model year carries the same 9-liter capacity and the same 150,000-mile or 60-month change interval as the 2018-2020 versions of the same engine, indicating no revision to cooling system specifications between those years.
  • The 150,000-mile service interval is paired with a 60-month time limit under normal use conditions, meaning whichever threshold arrives first governs the change point regardless of mileage accumulation rate.
  • A 60-month interval translates to five years between coolant changes under normal use, a schedule associated with modern long-life coolant formulations designed to maintain corrosion inhibitor effectiveness over extended periods.
  • The uniform 150,000-mile and 60-month interval across all four configurations in the specifications reflects no differentiation by drivetrain type, engine size, or model year within the 2017-2020 range covered.

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