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hello, i have a 330 ci on a 2000 reg which has a oil leak from the off side, top of the engine which drops onto the manifold and burns, i've tried seeing where its coming from with no luck and done a search on the net but only found 1 sensible answer which said it could be a crank case vent valve or a hose going to it leaking. just wondering if anybody has any ideas?
many thanks
 

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Crankcase valve piping seems a good place to start. See HERE. You can also see if there are leaks around the vanos solenoid and the manifold adjuster unit.
 

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Could also be cam cover gasket(valve cover gasket as some say), common after time, the rubber goes hard
 
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