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I have a 2001 1.9 turbo diesel that is blowing oil out thru the engine oil cap. My Mechanic checked the compression and all cylinders were in excellent condition. Has anyone ever had this problem? Or does anyone know what else to look for? Thanks
 

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More specifics, at idle or revving up the engine? Is there evidence of leaking or is it gushing out?

The vacuum pump exhausts through the cylinder head so all the vac pump exhaust and cylinder blowby will come out an open oil cap. It normally goes through the black hose back to the intake.

If the gasket is loose or missing it could leak out.
 
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