every 30,000 miles. to be safe.
by taking it to a 10 minute oil change place or a dealership.
I have the same year intrigue also its at the bottom of the air filter box
5.5 quarts in the 3.5L 4.5 quarts in the 3.8L These amounts include a filter change.
Under the air filter housing
it is located down by the oil pan, it's a cartridge type filter,
If you look under the car it is by the passenger side tire
74-76mm 15 flute end cap style oil filter wrench
I believe it is located under the air filter in the air filter box on the drivers side of the engine compatment.
Oldsmobile Cutlass Supreme
It has no cabin air filter.