Ken, I've never met one of these Jeeps, but as no one has directly answered your question and following on from what Rob has said, Then I'd say: Yes, The excessive crank case pressure could very well increase oil consumption.
Changing a negative pressure in the crankcase to a positive pressure would likely be enough.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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