I've replaced the gasket twice on the turbo drain (where the drain tube meets the turbo, NOT the oil pan) and it still leaks. I replaced once when I did the whole drain tube assembly and then once again once when I noticed it leaking once more. What could I be doing wrong? I am debating taking off the exhaust manifold and replacing that gasket (as it too leaks very slightly) and with that off I can really clean both surfaces (at the turbo and the drain tube) properly and make a solid fit. But I am wondering how big a job that is and how long it will take...My car is a daily driver and it can't be out of commission for very long, leak or no leak.

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1983 300SD White with Grey interior

My turbo was leaking from a cracked/twisted oil supply tube. I had to replace it.

The gasket that connects the supply tube to the turbo/ can leak also.

It is easy to leave a bit of old gasket on the feed supply and drain tubes that will prevent a good seal.

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