Hi russreo. Welcome to the forum. A plugged pcv valve will not CAUSE an oil leak, but it can cause oil to be pushed out of a leak that was about to occur anyhow. It will increase leakage from a non-pressurized point where the oil drains down such as through a head gasket. It will not increase leakage from a pressurized point. In particular, a camshaft seal is probably the most likely suspect. You will have to remove the timing cover to see how high the oil is. The crankshaft seal is a common source of leakage too but the oil will all be down lower. You have to decide too if oil higher up is being flung from the crankshaft or if it is running down from the camshaft.
The valve cover is another possibility but there will usually be oil running around the front and back of the engine too.
Friday, June 18th, 2010 AT 2:54 PM