All personal opinions.

I can't remember any damper that keeps the lower steel oil pan from coming off. Not that I am saying you need to remove the steel pan.

There is the turbo drain with the bottom grommet and O-ring that can lea bad. There is also a 1/4-inch tubing that runs from the Beather/oil Seperator in the air filter housing and ends up between the block and turbo drain.

Both ends of that have to be over their nipples and the O-rings need to be good.

Somewhere mid-way is a clamp that bolts onto the metal bracing under the turbocharger. It is held one of 2 ways. One is a Sheetmetal clamp with a rubber sleeve and the other way is a piece of steel welded to the tubing.

On the one when the rubber sleeve disappears the clamp rubs a hole in the tube. On the other one the welded area can crack. Either case can cause an oil leak.

The tubing from the transmission to the radiator uses similar Sheetmetal clamps with a rubber tube and the rubber on those can disappear and rub a hole into the transmission tubing also leaking oil.

The steel oil pan gasket can also leak.

The valve cover gasket can cause a leak and the oil can rundown.

Best to degrease the engine and find where the leak is.

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84 300D, 82 Volvo 244Gl Diesel