Nissan Sentra burns up oil, but only on the highway

  • by: PAUL BRAND
  • Updated: September 7, 2012 - 9:22 PM

Q I have a 1998 Nissan Sentra with a 1.6-liter engine. It does not leak or use any oil except at highway speeds when it uses up to a quart of oil on a 300-mile trip. I replaced the PCV valve and it seemed like the problem was fixed as there was no oil usage for a trip or two. But now it is acting up again. Is it possible the new PCV valve is at fault? It seems to be working properly and, when I remove it at engine idle, it makes a hissing sound and there is a strong vacuum when I place my finger over the valve inlet. The ventilation hoses seem fine and unobstructed. Any ideas?

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