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5.9 blowing oil


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I am working on a 06 5.9 cummins. Its blowing oil out the vent at running rpm. ie like down the highway. no power loss or fuel mileage loss. rough idle when its cold. but when warms up it runs like it was brand new but the oil. stock truck. 120,000 miles

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I believe by 06, the vacuum pump was off engine electric operation... (only earlier, vacuum pump seal failure could pressurize the crankcase).Blowing oil out... Usual causes of crankcase pressure... blowby, failed piston... head gasket... How's the oil look? Any water contamination? For that matter how's the coolant, color, condition, bubbles?

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