I'll just add some text along with Rogue'* picture above.
Make sure the engine is cold and the car is on level ground before proceeding.
You will need something to to remove the oil from the supercharger, most often a turkey baster is used with a short (6") piece of hose that fits over the end but not too large it won't fit through plug in the supercharger. A large syringe can also be used.
You will also need a container to hold the old oil and you will need to take measures to prevent spillage - the old oil STINKS! Be sure to perform this in a well ventilated area.
If the engine cover is in place you will need to remove it. Begin by removing the oil filler neck and cap in the front valve cover. Grab the neck under the cap (you can either remove the cap first or not) and gently push down while turning counter clockwise. Next you will remove the cover bolt on top of the supercharger, this is normally a 10mm nut.
Lift the cover at the front about 10" until it clears the bracket that retains it in the rear of the engine. The cover slips underneath a rubber section of the rear bracket. Once high enough in front you can then pull it towards the front of the car to remove it.
Find the inspection plug on the supercharger snout. It'* located near where the snout mates to the housing, on the lower part of the snout facing up and towards the front of the car. The plug is easy to identify because it is unpainted and stands out against the grey of the snout. Remove the plug using a 3/16" allen key. It would be wise at this point to place paper towels around the area to absorb on drips. Have an open container ready for the old oil at this point.
Place your short piece of tube over the end of the the turkey baster and squeeze the bulb to exhaust the air then insert the tube through the inspection plug hole. Release the bulb slowly and allow the oil to be sucked into the baster. You will not get all of the oil in one shot so carefully extract the tube, evacuate the oil into your container and reinsert the baster repeatedly until no further oil is picked up.
Use a small funnel to fill the snout, depending on how much oil you removed you may need anywhere from 6 to 8 ounces of oil. The correct fill level is up to the bottom of the threads of the inspection plug. Once full, tighten the inspection plug to about 10ft. lbs torque.
Reinstalling the engine cover is optional, the engine will run cooler without it.
Hope this helps.
40th Anniversary Edition
13.074 @ 106.579
FWI | 4" Intake | LQ4 | N* TB | Custom TB Adaptor | Ported SC | 2.8" Pulley | Custom Intercooler | Ported LIM | Custom Ported Heads | 105# CC Springs | Modded Retainers | Oil Restricted Push Rods | CC OE-R Lifters | XP Hot Cam | TOG | HF Cat | 2800 ST | 3.29 Gears | DHP PowrTuner | LC-1 Wideband | Engine now retired |