Automatic Transmission problems of the 2005 Infiniti G35

I have a 2005 G35 coupe w/ heavy oil consumption problems. My car is consuming roughly 3 quarts of oil every 2,000 miles and Infiniti has done an oil consumption test and had one of their techs look at my car and they determined that I needed a new engine but they will not warranty a new one for me. The corporate hq told me they took pictures and a sample,that they have yet to show me and are going to void my warranty. I have since taken it to another shop and they don't agree with Infiniti findings and corporate has still not sent me anything in writing or any pictures of their findings. All I got was a phone call saying they were going to void my warranty and I spoke with the service tech and he does not agree with the findings either and said that my modification to my car does not cause that much oil consumption and I am being shunned away by the dealership. I am also apart of a G35 forum and there are many threads/posts of people with the same oil consumption problem and they are getting the same treatment and I believe that this should be a recall on these engines and I need, along with other need to receive a new engine. Infiniti/Nissan knows about this issue but they will not come clean with their findings and are blaming the customer and I honestly do not think it is fair.