Under the big cover, there is a plastic plenum (aka upper intake manifold). In the end of this is a spring loaded device which contains the PCV valve. If you replace the PCV, take care to reuse the o-ring and spring which are present. If you miss either one of these, you won't like the loud noise created by your engine. :)
It is located under the motor, front and center. To access it, you must get under the vehicle.
yes They are all the same on the body parts
The PCV valve on a 1998 Oldsmobile Intrigue is located under the MAP sensor. If you remove the large plastic cover with 3800 written on it and look to the left side of the engine there is a sensor marked (Pressure Sensor) with 3 wires going into it. Unplug that sensor and turn it counter clockwise and lift it off and you will see the PCV valve under it. Here is a picture to go along with my answer. http://autorepair.about.com/library/illustrations/bl795lib.htm
12.3 quarts
Yes
never use it
The 1998 Oldsmobile Intrigue gets an estimated 19 mpg in the city. The vehicle gets an estimated 30 mpg highway mileage.
R-134
The Antenna is built into the rear window.
http://www.youtube.com/watch?v=QKdDTupYOCM Its for a 1998 Buick Century, but I believe it is the same on the Intrigue
4.6 US quarts
Remove the lower radiator hose.