Welcome to the 370Z forums. Post some pics of your Z if you can. Install the Z Speed Performance CMAK ASAP if you have a M6. Tell the Nissan dealership service department to check for possible worn synchros in 5th gear. If you are going to the Nissan dealership service department for service go with the technician for a test drive and show them the issue. Definitely read the forums here you will find a wealth of knowledge.
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Mr. Clean
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