The AUSubaru.com.au Forums

found this almost guaranteed to fix blown head gaskets, cracks, warps and just two cars have an exception to full conditions of warranty, Subaru boxer is one of them, at the bottom of the page, in the middle of red text.

Sherpa and Fiori owners can relax

http://www.heal-a-seal.com/

Probably a mixture of bars leaks & chewing gum...