The bottom line is this:
No one here will be able to tell you what happened.
You should check your oil level with the dipstick regularly, but realize that sudden, massive leaks obviously won't be caught with a weekly dipstick check.
You have an uphill battle with Nissan if you want them to replace your motor, given that you have no proof of who changed the oil or how the leak/burn occurred.
We can now close the second thread on this issue.
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2013 Cadillac V-Wagon, RIP Z
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