One problem related to crankcase (pcv) has been reported for the 2006 Nissan 350Z. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan 350Z based on all problems reported for the 2006 350Z.
I bought a 2006 Nissan 350z. One morning after about 4,000 miles of mostly highway driving, I heard a strange sound coming from under the hood that sounded like valve tapping. It got louder and louder as the engine got warmer. I recognized the sound from an old work van that I used to have before the engine blew due to it having no oil. Sure enough, the crankcase was empty. There was no oil and the engine took a full 5 quarts of oil. There are no external oil leaks on the engine. I found out that the Nissan "revup" engines in the 2006 350z have an oil consumption problem. I took the car to a Nissan dealership, where, after an oil consumption test, informed me that burning 1 quart of oil per 1,000 miles is normal. Nissan is aware of the problem and has issued a TSB. They need to do a recall, an engine seizing can lead to an accident and kill people. Thanks for listening.