OK, here's the deal I"ll try to keep a long story short):
On the day of the event, my FX45 was towed to Infiniti of Tyson's Corner in VA (Rosenthal Inifiniti). It took 2 weeks and several calls to Infiniti's consumer affairs # for them to finally come to a decision to DENY my warranty claim, citing "Lack of Maintenance".
I had provided them documentation for all but 2 oil changes (these are the two I did myself...no receipts for oil. This is what they based their denial on. My OCI's were every 5,000-8,000 miles. Much highway/turnpike/interstate driving.
I had the car towed to my dealership in PA (Infiniti of Ardmore) at MY expense. They fought for me, and 2 months later, after bickering, opening a case with the BBB/Autoline, having the service manager IN MY GARAGE to take pictures of the old collected oil, the jack, jack stand, oil collector pan, and socket wrenches I used to change the oil, Infiniti finally agreed to replace the engine under warranty.
Root Cause of engine Failure: Defective connecting rod bearing in #1 cylinder.
Thank you to the service management team and ownership of Infiniti of Ardmore for duking this out with Infiniti. I would have been screwed without their passion for customer service.