The Nissan engine oil warning light is garbage. A number of people who initially had failed oil cooler lines never saw the light come on until the engine was already toast. It sounds like you had a low engine oil situation and the engine finally died due to oil starvation. The single best thing you can do in any car is check your oil level with every fuel fillup. If you went 7,000 miles between oil changes without checking the level, there's a good chance your car just consumed enough oil to put her in the danger zone. Just show Nissan your oil change schedules, underscore that you brought the car in for diagnostics and they did nothing, and hopefully it'll get covered under warranty. Your best bet is to really emphasize that you brought the car in for inspection and they didn't find or do anything.
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2013 Cadillac V-Wagon, RIP Z
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