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Not only is this something that should be done once a year, and its very easy to do. Often from the factory they come under-filled and you will find that they come with the Vilest smelling oil known to man. It is not synthetic oil as some dealers suggest, but a very specific oil made for GM superchargers. Parts Needed:
You will need two bottles of GM supercharger oil, GM p/n: 12345982 Tools Needed:
Turkey baster
Short hose- needs to fit over end of turkey baster, and in s/c plug, about 6" long.
3/16 Allen wrench or hex bit. NOTE: Make sure that your engine is cool before starting this! Steps:
1) Unscrew the super charger oil inspection plug
(a black plug at the front of the super charger snout using a 3/16 hex head). 2) Insert the tube (that's attached to the turkey baster in to the hole and suck out as much oil as you can.
This may have to be done many times to remove as much of the oil that you can.
Dispose of your old/used oil with your old motor oil in an environmentally SAFE manner. 3) Add the oil until it fills the snout to the bottom of the threads. It will take almost two bottles.
Be careful to NOT overfill! 4) Screw the plug back in and do not over torque. 8-12 ft/lbs is more than enough! 5) After driving around for a day or so, check the oil level while the car is on a level surface.
It's also a good idea to check the level of your supercharger snout at every oil change. Credit goes to Jerry Homolka from ClubGP member 1682
I modified it a bit to fit my taste/needs.
Applies to the following vehicles: 1997-2003 Grand Prix GTP & Regal GS Good Luck and Remember.
Change Your Mind, Not Your Oil.
Use the First In Synthetic Motor Oil's.
See My Bio For Information & Contact Details.

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Q: When changing supercharger oil on 98 grand prix gtp how much oil should be replaced and where is reservoir?
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