[FRS Dad]

Okay, here's my plan. Since I'm neither a mechanic nor an attorney, I'll ask my kid brother Matt, who's a master tech with 25+ years of experience what the OP should be concerned about and the right way to remedy the fluid mix up. Then I'll ask my buddy Tom, who's a general all purpose bottom feeder lawyer (and I mean that with no disrespect...he does really well at it) what his proposed course of action would be.

Matt's gonna say the engine needs to be torn down, the parts inspected and cleaned and the factory rep from Subaru needs to sign off on it, but he may surprise me. Tom will suggest the OP accidentally slip and fall in the Customer Lounge as soon as possible. He may surprise me too, but I doubt it.

I'll post results tomorrow.