Near your oil filter or under it, I'm gonna say Oil/Coolant thingy gasket..it's under the oil filter ( and by under I mean, between the filter and the block) tucked up behind the PS pump, not terrible to do yourself..
When going to a shop for help, please keep in mind that most techs get paid by "flag hour" meaning when/if he/she fixes or diags your car then they get paid...so if there's no charge, and there's good info resulting from eyes-on, tips are nice! I only say this because, I'm a tech and I have to do "free visual inspections" in the heat, for $7.75 an hour...nobody tips anymore and it's just plain mean to make folks find problems for free
so before this turns into a rant...
Make sure you can find some freshly leaked fluid..after above stated cleaning has been done..degreaser and some high pressure wash, then you'll be able to see the area better, and the color of fluid will be a bigger give-away
as Ripped said he had a ps leak, but you said oil...
Which is it, red or black?