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For optimal performance, General Motors suggests using the SAE 5W-30 motor oil with the 2001 Cadillac DeVille, equipped with a robust 4.6L engine. While semi-synthetic and conventional oils are also suitable, the Cadillac DeVille performs best with a fully synthetic motor oil due to its superior protection, efficiency, and performance. Fully synthetic oils provide more longevity and better performance compared to semi-synthetic options. General Motors recommends changing both the motor oil and oil filter every 3,000 to 5,000 miles when using conventional oil. If using synthetic oil, whether fully synthetic or semi-synthetic, it is advised to change the oil and filter every 7,500 to 10,000 miles.
The recommended oil for the 2001 Cadillac Deville is sae 5w-30.