2005 Nissan Quest 3.5 S 4dr Minivan (3.5L 6cyl 4A)
We purchased it brand new in '05.
We had few complaints for 5 years.
In January 2011 it started blowing smoke from the exhaust.
The van had 30k miles on it and there were no "warning" lights coming on.
Despite proper maintenance, the oil was low and sludgy.
To condense a very long and frustrating story; we took it to the dealer multiple times trying to find the problem.
$400 later we were told the engine was basically fried and they couldn't explain it.
We tried to get assistance from Nissan as the van had low mileage.
Our mechanic told Nissan it was not a maintenance issue, they refused to assist because I was missing a couple receipts to prove it was properly maintained.