1999 Cadillac Deville OCTANE REQUIREMENTS

1999 CADILLAC DEVILLE
125,000 MILES • V8 • 2WD • AUTOMATIC
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KENNYGLIN
  • MEMBER
  • 1 POST
With gas prices so high, do I have to use 91 octane gas or can I use 87 octane?
Nov 5, 2008 at 5:54 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Try 87 if no knocking your good.
Nov 6, 2008 at 1:41 AM
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