This is usually an indication of an engine that is "breathing" heavily That is the internal pressure of the crankcase (not the combustion cylinders) is some what excessive. This can be caused by a number of things, primary worn or broken piston rings. When a cylinder is not sealed properly, this is the primary function of the rings, excessive crankcase pressure builds up and as this is vented via the P.C valve back to the air filter, the extra air being vented is carrying atomised oil particles, which condense in the cooler air filter and collects as oil build up. The first thing to do is have a compression test completed to asitane the condition of the rings, With this knowledge your mechanic can advise you on the best course of action.
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Friday, November 23rd, 2007 AT 1:58 AM