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In 2014, the Cadillac XTS requires 5.5 US quarts (5.2 liters) of oil for the 3.6-liter engine without a turbo and 6.6 quarts (6.25 liters) for the twin-turbo engine. Buick advises using engine oils with the dexos1® certification mark. The recommended oil type for this vehicle is SAE 5W-30 full synthetic for the 3.6L V6 engine. Neglecting to change the oil can lead to decreased viscosity, resulting in inadequate lubrication of internal engine components like pistons and cylinders. The engine may also burn oil during heavy use, so it's important to monitor oil levels to prevent this. When changing the oil, remember to replace the oil filter too. Regular oil changes are crucial maintenance tasks, which is why vehicles now come equipped with oil lights to remind drivers of this important service interval.
The 2014 Cadillac XTS can hold 5.5 quarts/5.2 liters of oil if it has the 3.6L engine without the twin turbo. But if it's got the twin turbo engine, it can take up to 6.6 quarts/6.25 liters of oil.