Definately use the oil seperator, it will cut down on oil consumption, and maybe save it from an untimely death if anything happens to cause much oil, or mist to form under the valve cover, which if sufficient in volume would result in a runaway engine..

Point of note for those not familiar....the 78 and 79 300SD had no oil seperator at all.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche