When warm (after you drive it for a while) let it cool down some, and remove the allen head/hex head plug from the snout. Make sure you use the correct size allen wrench so you don't strip out the head of the plug.
I am the creator of the syringe sucker, and have used this method for many years, even before I owned my GTP. Works awesome.
Insert hose into snout, pull back sucking all the old oil out. You have to do this about 3 or 4 times to get it all. I will put the used oil in a old bottle with a screw lit that seals it inside. I will dispose of this oil, with my regular engine oil.
Using 2 bottles of GM oil, refill. The fluid level should come to the bottom of the threads of the plug. (flash light helps to see this sometimes)
2 bottles is all you need, nothing more or less. GM some times will under fill, as well as over fill many of these bottles, as long as its to the bottom of the threads, you will be alright. I have NEVER needed more than 2 bottles of the GM oil per supercharger.
Reinstall plug, CAREFUL not to cross thread it into the soft aluminum. Also, now is a good time to check the condition of the o-ring on the plug, making sure its still round, and pliable. If its flat, dry, and cracked, might look into a new replacement. I replace these with a Viton replacement. Part number for that is 012-75 for future reference.
~F~
