One problem related to funny engine noise 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.
Oil consumption. I have a 2006 350z with 22k miles on and at my last oil change I noticed about 1. 5 quart oil consumption in less than 3000 miles. I tried regular and synthetic oil and seems to be the same issue. Engine is making a funny noise always. Noise is like lifter -type sound. It goes off after 4000 rpms and get worst when driving up hill.