I've got a tractor that has a 4BT Cummins engine with an oil leak. I've narrowed the oil leak down to the turbo return line where it goes into the block. It's a hard line that should be pressed in but I'm able it slide it in and out a bit. Has anyone else experienced this what did you do for a fix? Looks like there are some options to go to a flexible line or AN line with some adapters. Anyone have experience with these conversions.