Few months after the standard manufacturer warranty expired, ignition coils got burnt. Fortunately, I had extended warranty which covered it otherwise, it would have costed me some $800. Dealer initially denied that it's a covered repair and I had to call Nissan to convince him. A little research revealed that it's a common problem with Maximas and Nissan didn't do much to help out poor consumers.
Just 3 weeks after my extended warranty expired, at 74k, dreaded service engine soon light came on and it turned out to be problem with Catalytic Converter and O2 sensor. Cost estimate: $1200. Again, after some research, found that Catalytic Converter is covered up to 80k/8years. Ended up paying $170 for O2 sensor. Dealer squeezed some more to replace brake pads, driving belt which are wear and tear items.