My engine was consuming oil way too fast, the oil pan would be empty after driving about 3000 miles, for 6-8 months I went back and forth with the dealerships here about this problem but they kept blaming it on my modifications. (high flow cats, intake, exhaust) The engine ended up blowing on I75 and Infiniti of Gwinnett did replace it under warranty but during those 6-8 months I caught hell going back and forth with the dealerships. The main thing I learned though is if you go the legal route the burden of proof is on them.