All-
I just bought an w116 SD intake, and since I have observed some significant oil leakage around the turbo drain grommet I'm going to pull the turbo and replace everything, including the oil separator check valve, oil separator o-rings, intake, intake gasket, turbo gasket, and all associated gaskets for the mounting of the turbocharger. Is there anything else I should do while I'm at it? I'm also looking for intake torque value, and the torque values for other gasketed locations that are important. And do you think that a thin application of aviation Permatex would be a good thing to augment the gaskets with.
Looking forward to an EGR-less system that doesn't leak so much oil from the turbo. Thanks

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

You can replace the turbo drain back tube without removing the turbo. The tube just slides down into the oilpan and then out. If the permatex your talking about is a really dark brown thick liquid from a can I would not use it. When that stuff is used nothing ever leaks again but it's really difficult to remove if you need to down the road. RTV silicone is your best bet in my opinion.

The red/orange high temp silicone would work on the intake. There is little that can stand the heat on the exhaust side.