 I bought my '07 Maxima new. Now have 50k miles on it in 2.5 years. Until 3 weeks ago only put oil in it and normal preventative maintenance like rotate tires and check fluids. Recently took it to the purchasing dealership service dept. and they say the CVT transmission is going bad. Luckily it is under warranty. (60k miles) I first noticed a light tapping noise at slow speed coming from the front end. Now three weeks later I am waiting on a new transmission to come in as they do not have re-manufactured ones because they are too new. Still runs,  but the tapping noise is irritating. Did not pay the $$ I did to have it go bad. When working fine, the CVT is GREAT. Otherwise, I love the car.