What kind of oil brand should you put in a 1999 intrigue Oldsmobile?

The 1999 Oldsmobile Intrigue's owner's manual is the best source for the correct oil type and viscosity. However, generally speaking, a conventional or synthetic blend motor oil meeting the API certification SM or later (SN, SP, etc. - newer is better) is suitable. The viscosity grade will depend on your climate.

* For warmer climates: Look for a 5W-30 or 10W-30.

* For colder climates: A 5W-30 is generally recommended even in colder areas.

Do not use an oil that only meets API certifications older than SM. Always consult your owner's manual for the manufacturer's specific recommendations. The manual will often specify the oil type (conventional, synthetic blend, or synthetic) and the viscosity grade. Ignoring the manufacturer's recommendations could damage your engine.