8 oz. With the SC on a level surface that should bring it right up to the bottom of the threads.

Amount of oil in supercharger:
4oz for the M62
8oz for the M90
Rule of thumb. To the bottom of the threads for the fill plug hole.

Type of oil to use:
GM Supercharger oil or Mobil 1 5w-30

Same coupler fits all versions of the M62 and M90 superchargers.

M62 owners may have difficulty finding the supercharger and throttle body gaskets. The demand is low and this can sometimes be an issue. Note: FelPro supercharger gaskets come with the o-rings. GM gaskets do not come with the o-rings.

Might be better to buy the gasket material and make your own.