I used Permatex Aviation Form-a-Gasket. I'm a big fan of it, but it may make future removal difficult. Since I put a brand new OEM water pump on, I'm guessing there will be a complete engine rebuild before the next water pump replacement so I'm not too worried about it.

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'79 300D, Ivory "Gunther" ......going
'81 300SD, Metallic Blue Silver, The Grey Ghost.....going
'87 300D Turbo ...gone
'05 CDI.... gone