Question about 2000 Daewoo Leganza

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Oil in my spark plugs!

I have a '99 Leganza that I bought in 2000. In 2004 I blew a rod in the engine and had a newer, 2000 engine installed. Now I've found that my spark plugs are becoming fouled with engine oil. I replaced the plugs and the car started and ran fine but after trying to start it a few more times, within 24 hours the plugs would fill up with oil again. I had the head cover gasket replaced but it keeps happening.
What could be the cause for this and how can it be repaired?

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RipPanther1@yahoo.com
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