Buick Lucerne (USA / CAN)

Coolant capacity & service interval

Buick Lucerne (USA / CAN) coolant capacity ranges from 9,2 to 12 liters. Service intervals include checks every 12 months and changes every 240000 km or 60 months. The data covers 6 configurations.

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

TypeSpecifications
Lucerne 3.9 FlexFuel V6 (2011-2011)
  • Use: Normal
  • Capacity 9,2 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Lucerne 4.6 V8 (2011-2011)
  • Use: Normal
  • Capacity 12 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Lucerne 3.9 V6 (2008-2011)
  • Use: Normal
  • Capacity 9,2 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Lucerne 4.6 V8 (2008-2011)
  • Use: Normal
  • Capacity 12 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Lucerne 3.8 V6 (2005-2008)
  • Use: Normal
  • Capacity 10,5-11,2 liter
  • Check 12 months
  • Change 240000 km/ 60 months
Lucerne 4.6 V8 (2005-2008)
  • Use: Normal
  • Capacity 12 liter
  • Check 12 months
  • Change 240000 km/ 60 months

Additional Notes

  • The Buick Lucerne 3.8 V6 cooling system capacity is listed as a range of 10.5 to 11.2 liters for the 2005-2008 model years. A capacity range rather than a fixed value typically reflects variation between a drain-and-fill service and a full system overhaul, where the higher figure accounts for residual fluid in the heater core, reservoir, and block passages.
  • The 3.9 V6 and 3.9 FlexFuel V6 configurations both carry a fixed 9.2-liter cooling system capacity, which is notably lower than the 3.8 V6 range despite the larger displacement. Fixed single-value capacities generally indicate a well-defined system volume with minimal variation between service procedures.
  • The 4.6 V8 holds the largest cooling system capacity across all Lucerne configurations at a fixed 12 liters. A larger capacity in a V8 application is consistent with the greater engine mass and heat rejection requirements of an eight-cylinder engine compared to the V6 variants.
  • All six configurations share an identical coolant change interval of 240,000 km or 60 months under normal use conditions. The 60-month figure equals five years, meaning the interval is time-limited regardless of whether the distance threshold is reached first.
  • A separate 12-month coolant level check interval applies to all configurations. Coolant level checks at this frequency are independent of the change interval and serve to monitor for gradual loss through evaporation, minor seepage, or system pressure changes over time.
  • The 4.6 V8 specifications appear across three distinct year-range entries covering 2005-2008, 2008-2011, and 2011, yet the capacity and service intervals remain identical across all three. This indicates no cooling system specification changes were introduced for the V8 across the production span covered by the data.
  • The 3.9 V6 covers 2008-2011 while the 3.9 FlexFuel V6 is listed only for 2011, with both sharing the same 9.2-liter capacity and service intervals. FlexFuel designation refers to an engine calibrated to run on ethanol-blended fuels such as E85, though the cooling system specifications for both variants are identical.

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