What type of oil goes in a 99 cadillac deville?

The recommended oil type for a 1999 Cadillac DeVille depends on the engine it has. There were a couple of different engines offered that year. You must check your owner's manual to be absolutely certain.

However, generally speaking, a 1999 Cadillac DeVille likely requires either:

* 5W-30: This is a common viscosity for many vehicles, and a good starting point if you don't know the specific engine.

* 10W-30: Also a possibility, especially if you live in a warmer climate.

Crucially: The owner's manual will specify the *type* of oil (conventional, synthetic blend, or full synthetic) as well as the viscosity. Using the incorrect oil can damage your engine. Look for this information in your manual or consult a Cadillac dealership or a qualified mechanic.