Have you even jacked it up and put it on stands to inspect it properly instead of asking a forum where YOUR car is leaking? Being a commodore, I'd say it was the factory installed Power/Steering leak or possibly a rear main seal leak... Cheers Mat
True that ^, to be sure degrease the rack properly (so it is clean) & as stated above jack up vehicle. You will see if it is the PS rack leaking or elsewhere, if all that grease is cleared away as shown in the images provided. Drive around after thorough degreasing of the PS rack, then check & upload more pics if need be. I'm sure with a better view point we can then help you out a little more.
You should clean all that crap off and check the car every few days and you should see where its coming from. One check you can do now tho is check what colour the oil is, red is steering and brown/black or golden is engine oil. however mine got that bad as it was leaking both the rack and rocker cover gaskets.
Is the power steering fluid going down? Like the above aside degrease it and drive about then have a look again.
