Thanks everyone for your input! I wish someone had told me, or my son had researched (technically, his car but I co-signed on the loan), about increasing the oil weight after the tune. I find it astonishing on this highly-modded vehicle that Subaru did not add an oil temp sensor into the stock mix for pennies sometime over the 17-year US domestic span. In three weeks a 2010 EJ25 with 20k miles will be swapped in, they may come over and let us do the clutch and steering rack for free. Recommendations on the new clutch, ACT or Exidy? Also, the shop will take my old engine and rebuild it, so I'll hopefully get a forensic (eventually) on what went so catastrophically wrong in a short period.