The 2.5L is an Inline 5 cylinder engine run on a timing chain. Usually you replace them every 100k, but you can go longer, you just have to listen for the chain noise. But since the water pump needs replacing do the chains while you're at it.
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you might want to get rid of the car or face paying alot of money to have it fixed. Vortex Media Groupnot sure if you can read the link.
the early 2.5's 2005.5-early 07 suffer from timing chain and guide failure. the guides wear down and the chain eats into the block. basically ruins the engine. this happens around 100,000 miles as well. vw fixed the issue for the 07+ 2.5's.
if its over 100k i would look into getting the timing belt and water pump done to be safe.
2.5 motors do not have a timing belt. It has a timing chain which is "supposed" to last the life of the motor. The early motors had some issues with faulty designs of the chains and guides. Timing chains by design are extremely labor intensive to replace. If the water pump is leaking, that alone should be addressed.
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