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What type of oil should be used in a 2002 Cadillac deville?

The recommended oil type for a 2002 Cadillac DeVille depends on the engine it has. The DeVille that year came with either a 4.6L Northstar V8 or a 4.9L V8. You must check your owner's manual to be absolutely certain which engine is in your car.

However, generally speaking, a 2002 Cadillac DeVille would typically use:

* 5W-30 synthetic blend or full synthetic motor oil. This is the most likely recommendation.

Crucially: Don't just rely on this information. Consult your owner's manual. It will specify the exact viscosity (like 5W-30 or another) and the type of oil (synthetic, synthetic blend, conventional) recommended by Cadillac for your specific engine. Using the wrong oil can damage your engine.