UMPhil

So, knowing that my high mileage GT has suffered a blown head gasket kind of sucks. I visited my Jiffy Lube, who had done a radiator flush just before the car began showing symptoms. The rump roast. Manager told me that the subaru head gaskets will go if the line is not bled properly. He told me that only the manager does them because of the risk involved with a difficult bleeder. After some investigation, it became clear that the manager was not working when my car had been serviced. I spoke with the local subaru mechanic and he said that the vast majority of blown HGs that they see (which is a lot of cars) present within 3,000 miles of an improper flush and bleed, regardless of miles on the car. Jiffy Lube's insurance would like me to prove that they caused the damage or to show negligence. I would argue that letting someone other than the manager do the job and not telling me of the danger and letting me make the informed choice was negligence. I don't know if they see it that way. They would like to see my evidence. A lot of people throw around their opinions here. My question is: Does anyone have any documents or statements from subaru or Jiffy Lube that might help me show the connection between the failure and the improper flush?