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Suspected head gasket or water pump? [Golf mk4]
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That has more than head issue a complete half arsed rebuild tbh
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It is what they call blow-by, it happens when the rings are so worn that when fuel is combusted the burnt fuel blows by the rings into the sump and out of the rocker cover vent tube back into the inlet manifold to be burnt again,
But if you take the oil filler cap off it comes out there. it all means your rings and or cylinders are worn, and wont be long before you need a engine recondition. and also could be the exhaust valve guides and seals worn but if its got to this stage,what i said previously. Put your hand over the oil filler hole to see how much pressure there is, a good engine should have no pressure, a stuffed one you will feel the pressure,
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