Hi there, as this post is a few week old you may already have resolved this, but I will give an opinion just in case. Normally there is no reason for the water pump to start leaking after an oil change. What you will have to find out, is if they tightened any fan/ drive belts during the service, as it is possible that if they did, they may of over tightened the water pump belt and overloaded the bearing and seal.
Mark (mhpautos)
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Sunday, November 18th, 2007 AT 6:06 AM