 I bought this new 2015 Infiniti Q40 AWD from Beshoff Infiniti (San Jose) on Feb 28, 2015. After driving this noisy car for three months, or about 3000miles, I started having ringing in both ears (tinnitus). It became more and more obvious after I drove this Q40, and I have trouble to sleep since then. I also start losing my hearing in both ears, especially for the low voice from a meeting in a group or in a noisy environment, or someone with bass voice in the phone. I have contacted Beshoff Infiniti in June 2015 when I noticed the tinnitus caused by the noise.  They refused to take the car back with full refund and claimed that it’s normal car noise. I took my doctor’s suggestion to wear earplugs when driving this Q40 since then. After another 6 months of driving (total mileage is 10,000miles now), the tinnitus and my hearing didn’t get better, and it’s boring me a lot, both in my life and work. I contacted the dealer and the car maker again this month. They asked me to do a second road test and still claimed that it’s normal road noise. But this “normal” noise is killing me and I don’t think I can drive this car anymore. Because the dealer and Infiniti refused to help me with the problem, I did some noise tests and analysis myself, to figure out what’s going on. According to the result from Adobe Audition CC, a professional audio analysis software, the noise mainly from 100-400 Hz, that is the low frequency noise not sensitive to human being. This means, even if the driver didn’t hear the noise, the energy carried by this sounds will still go through the ear and damage the auditory nerve cells without immediate impact. The symptom is, you may not hear a loud noise (at 6000-8000Hz), but your ears are in the pain. The low frequency noise of this Q40 AWD carried much higher energy than another model made by Infiniti, the Q50, at this range. This indicates that the company has the technology and capability to reduce the noise, but they did not apply it to Q40 for some reason. I am in the progress of negotiation with Infiniti regional affair manager now. Infiniti remains to claim it’s the normal noise, and because it not the defect on any part of the vehicle, they cannot repair it or give a full refund as I requested, neither the compensation to the health damage on me. With no concern on the fact that this noise already caused severe and permanent health damage to the customer, Infiniti refuse to recall the cars and investigate the potential harm of the noise to the customers. It’s always difficult for individual to negotiate and reach desired outcome with the big company.  So far, total 8574 of Infiniti Q40 were sold in U.S. since Jan 2015 ( Infiniti sales stats: http://www.goodcarbadcar.net/2011/01/infiniti-g-sales-figures.html, the sales dropped from 1000 to 38 by Nov. 2015 ).  All these customers may suffer from the same noise. Some of them may have family members riding with them, including children. As a Ph.D. in Biology, I am aware that the auditory nerve cells are the only type of cell that cannot regenerate in human body. Once you lose the hearing, you lose it permanently. The public should be alerted that there is potential risk to drive this car, for both the current Q40 owners and the potential buyers. If you are the current owners of this model of Infiniti Q40 and have the same problem with it, please contact Infiniti regional affair. Live chat: http://nna.force.com/livechat/LiveAgent_NewInfinitiIFS?routingGroup=InfinitiGlobalNavhttp://www.infinitiusa.com/iapps/contactusInfiniti Consumer AffairsP.O. Box 685003Franklin, TN 37068-5003Phone: 800-662-6200Monday through Saturday:7:00 AM to 7:00 PM CTTwitter contact for customer support or questions: @InfinitiCare