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2000 Navigator Fuel Octane

Tiny
SMSGT178
  • MEMBER
  • 2000 ALL OTHER MAKES ALL OTHER MODELS
I would like to run regular unleaded in my recently purchased 2000 Navigator. I have a 1998 Navigator which I've ran 87 octane in since I've owned it with no problems so far. I know the 2000 has a higher horsepower rating and was concerned about any engine damage I might incur from running a lower octane gas than what is recommended by the manufacturer. I believe the 2000 still has a knock sensor and engine computer management to handle the octane situation, but want to be sure before changing over.
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Friday, January 6th, 2006 AT 11:29 AM

2 Replies

Tiny
SMOKINFLOYD4.3
  • MEMBER
  • 56 POSTS
All modern vehicles are designed for 87
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Friday, January 6th, 2006 AT 12:36 PM
Tiny
RJT1210
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Not necessarily the case. My '97 Mark VIII ran well ONLY on 92 octane or higher which was [u:af821e28d0]recommended[/u:af821e28d0] in the owner's manual. It wouldn't run right if I used 87 or 89 octane. And a '95 Continental I owned was premium fuel ONLY (not just recommended, but [u:af821e28d0]required[/u:af821e28d0]!).

I've been thinking about running 89 octane in my '98 5.4L Expedition. Haven't decided yet.
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Saturday, February 11th, 2006 AT 9:42 PM

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