Buick Century (USA / CAN)
Coolant capacity & service interval
Buick Century (USA / CAN) uses coolant with a capacity of 11 liters. Service intervals include checks every 12 months and changes every 240000 km or 60 months. The data covers 3 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| Century 3.1 V6 (2003-2005) |
|
| Century 3.1 V6 (1999-2003) |
|
| Century 3.1 V6 (1996-1999) |
|
Additional Notes
- The Buick Century 3.1 V6 carries a cooling system capacity of 11 liters across all three configuration spans covering 1996-2005, indicating a consistent engine bay layout and coolant jacket volume throughout the model's production in North America.
- An 11-liter cooling system capacity is a moderate figure for a V6 engine of the 3.1-liter displacement class, reflecting the volume needed to circulate coolant through the block, cylinder heads, heater core, and radiator under normal operating conditions.
- The coolant change interval is specified at 240,000 km or 60 months under normal use conditions, which translates to a five-year service cycle regardless of mileage accumulation if the distance threshold has not been reached first.
- A 240,000 km change interval is associated with long-life or extended-service coolant formulations, typically DEX-COOL or equivalent organic acid technology (OAT) coolants, which are designed to resist degradation over longer periods than conventional green coolants.
- The check interval is set at 12 months under normal use conditions, meaning the coolant concentration, pH level, and freeze protection are to be inspected annually even when a full change is not yet due.
- The capacity, check interval, and change interval remain identical across the 1996-1999, 1999-2003, and 2003-2005 configuration spans, indicating no revision to cooling system service requirements was introduced during the Century's production run in the specified period.