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Q: oil leak on 2003 Dodge Ram Van 3500

2003 dodge w/ 5.9 cummins. oil leaks from crankcase breather where it goes into valve cover. It has new breather and o ring. Has 385000 miles very well maintained. No problems with performance runs good no lack of power.No pressure when oil filler cap taken off to indicate broken ring etc.Any info would be helpful..Thanks
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Its high mileage it could be "blow bye", a cylinder leakage check may show the true health of the engine. Many automotive repair shops have a machine that generates an inert non flammable low pressure smoke that looks similar to cigar smoke. The intake manifold is sealed off, and smoke is put into the engines intake manifold. The smoke then fills the engines crankcase and if there are any vacuum or oil leaks from gaskets, hoses, or housing smoke emits from the source of the leak.
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