If you are not going to keep the car then the risk of the shortcut is a lot less than replacing the lines.

I say that because the chance of stripping the threads on the oil cooler are pretty high and a new oil cooler might cost more than your "beater" is worth. Also, if you are worried about your motor mount that's another can of worms.

I am sure that you can get some high pressure line that is about 15mm id and some clamps that will seal it. The tricky part will be to cut the metal lines so that you have enough line to clamp the hose on before the bend. you can probably put a little flair on the end so that the line won't slip off.

So do it and see how it works. Your worst case is that you will have to buy a couple of new lines and do it the proper way.

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Tom Hughes
St. Louis
84 300SD
92 300D
86 300SDL