The line was a high pressure steel line that came with the kit, for my feed, the return line from the turbo is a rubber hose thats 3 times the size. This steel line was sitting on a manifold, the oil got scalding hot went through the turbo and back into the motor superheated from the manifold. I run synthetic so it shouldn't break down, if you don't think superhot oil thats not broken down wont mess anything up in the engine then that leaves me with one thing, the O-Ring on the oil pump melted and I'm sucking air. Either that or a bearing is starting to go. The motor only has 6k miles on it. Maybe 7 oil changes