Timing chain guides are worn and are now unstable and can cause the timing chain to break which will ruin engine. nissan knows about this problem and has changed to a new part in 2010. it is ridiculous that they are trying to charge me 1500 dollars to replace a part that cost 2 dollars when they knew about it when i brought it in so many times to diagnose!!!!! there are countless timing chain issues with other owners thenewx.org you will find tons of complaints. *tr