Could this be the first real evidence of why you should not use Mobil1 5w-30 in these engines.
If you still had the oil, you may be able to send it to Blackstone Labs.
Were you on the stock tune ?
174,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. Also CHECK YOUR OIL, these cars use it.