[Slam]

Definitely a shot transaxle output shaft flange seal. That oil is throw from fluid leaking onto the CV, which spins and distributes the fluid as you see here. Yuck.

An easy job with some pitfalls. The biggest issue is removing the cheesehead bolts holding the CV to the output flange. There has been A LOT written about this, and given how rusty your bolts look, it's gonna be fun. WYIT you may as well clean and repack the inner CVs and maybe even flip them so they'll give you some more miles.

The other pitfall is that there's no stop for the tranny seal on the passenger's side of the transaxle. You have to drive the new seal in straight and measure the distance from the lip of the tranny opening to the seal. I'm sorry but I don't recall the spec.

There's one bolt that holds the flange onto the diff gear - it's a 6mm allen head.

Hope this helps. At least it'll get you started!