Jacobandnickolas Is/are correct, the oil change will not help. Are you sure the water pump is leaking.
The 3.8 litre engine in you vehicle is known for the intake leaking. The intake maniflold is made of plastic and degrades ove time (135k) and will leak coolant and/or oil. The leaking intake is often mistaken for a water pump leak on this engine and the leaking intake will cause the high idle untill the engine warms up.
Give us a little more info and we will be glad to help you out.
Thank you,
Dan
Wednesday, December 16th, 2009 AT 12:10 AM