ziggie Posted June 2, 2012 Report Share Posted June 2, 2012 What page of the owners manual is this on, I can't find it? Quote Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted June 2, 2012 Report Share Posted June 2, 2012 page 6-3 Gasoline Octane Use premium unleaded gasoline with a posted octane of 91 or higher for best performance. You may also use middle grade or regular unleaded gasoline rated at 87 octane or higher, but your vehicle’s acceleration may be slightly reduced. If the octane is less than 87, you may get a heavy knocking noise when you drive. If it is bad enough, it can damage your engine. http://www.gmprotectionplanwarranty.com/owners-manual/cadillac/2003-Cadillac-CTS.pdf Quote Bruce 2016 Cadillac ATS-V gray/black Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
ziggie Posted June 2, 2012 Author Report Share Posted June 2, 2012 Thanks Bruce Nunnally !! Quote Link to comment Share on other sites More sharing options...
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