Was driving car on highway when I got a check engine light them blew turbo maybe a minute later. After researching figured it was the banjo bolt (had no idea about this). Sent to mechanic with a turbo and he replaced. Picked it up and after a few drives had a radiator hose leak which my mechanic then fixed. Picked it up again and drove it 90 miles and about mile 85 whining, loss of power, and boom goes the turbo. I take a look and the hose that went from the top of the turbo to the reservoir was pinched (he used a short hose). When I parked the car it all of a sudden blew a hose off the radiator and cracked the nipple right off. So I figured it was blocking flow and it over heated the turbo and over pressurized the coolant system.
So I send it back to him with another turbo, a new radiator, and new hoses. He installs everything for free (although I still had to pay parts). I pick it up again and drive 90 miles. On mile 85, loss of power, whining, and boom goes the turbo.
He said he checked the oil flow and that the radiator fluid was flowing. He indicated a head gasket. So I got a tester and confirmed it was not.
I have no idea what to check or how to check it. Should I get an oil pressure gauge and try to t it into the turbo to see what the turbo is getting? Could it be something with the exhaust?
The thing that is throwing me way off is that it works perfectly for an hour and some on the highway and then goes. If it was an oil issue or coolant, wouldn't this happen sooner?
Any help would be appreciated.
Some background, I did a timing belt and water pump a few thousand miles ago as well as a new cat and exhaust system, plugs, etc. He also did an oil change when he replaced the first turbo but not the second.