There is a leak coming from the connection of the turbocharger oil supply line to the engine.

I want to know what I am getting into if I try to re-seat the supply line to the engine block? It appears that the supply line is not going straight into the fitting that goes into the engine block. See the attached picture.

Is there an O-ring that makes the seal between the supply line to the engine block or is it a metal-to-metal seal?

If I need to replace the entire supply line what are the minimum steps I have to take to replace it? Is there a link on this Forum that will help?

The car is a cherry 1991 350SD with 90K miles and 35K on a rebuilt engine with updated rods. This appears to be the only oil leak and I want to fix it. I am especially concerned that the line could just "blow" and kill the engine and turbo.

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1991 350SD (updated rods)
Biodiesel B100 when I can find it.
Dino when really cold outside