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SHIFT_2.5S »
https://forums.nicoclub.com/shift-2-5s-u73442.html
Tue Dec 25, 2007 1:34 pm
This is from Wikipedia about the QR25DE:
Manufacturing, design, and assembly flaws
The QR25DE sold in the United States has been subject to a significant number of problems in its short lifetime. A variety of mechanical flaws have led to numerous technical service bulletins, recalls, repairs, and outright engine replacements.
* Vehicles with the QR25DE may ingest material from a damaged pre-catalyst resulting in increased oil consumption.[7] * Power valve screws in the intake manifold may become loose and result in unstable idling or power loss.[8] * In June 2006, it came to Nissan's attention that approximately 85,000 Altimas and 2,000 Sentra SE-Rs equipped with the QR25DE and built between January and May 2006 may experience unusually high oil consumption. This can lead to premature engine failure and possibly a fire. While Nissan investigates the problem, owners of the affected vehicles are being advised to check their oil frequently (every 700 mi [1127 km]), and dealers have been instructed to place the affected vehicles on sales hold.[9]
The newer engines (2006+) have much less of these known issues and are much more reliable.