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Oil in the cooling system is never a good sign. Although you may not be experiencing any issues performance wise, yet. You will eventually if it is not fixed as it will start overheating.
The water pump failure and replacement would not cause oil to enter cooling system.
Either you have a blown head gasket or a blown intake manifold gasket. A dye test will tell you if your head is damaged in the event of a blown head gasket. It turns colors anywhere it is leaking on the head, hence where any cracks would be.
Hope this helps.
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Sunday, January 11th, 2009 AT 7:17 PM