ejscarfo Posted May 29, 2008 Report Share Posted May 29, 2008 Hi all. Its been a while since I've been on this site. I have a quick question, and hopefully, its an easy one to answer. I have a 1999 SLS with 82K miles. 99's are to be run with Premium grade gasoline, which is getting pretty expensive. I know the 2000's were changed so they could run on Regular. Can I modify my 99 to run on Regular? Anyone done this? How would it be accomplished? I'm curious so feel free to reply. Link to comment Share on other sites More sharing options...
steve6 Posted May 29, 2008 Report Share Posted May 29, 2008 i have always run 87 oct on my 99 sts's without modifications. Link to comment Share on other sites More sharing options...
BodybyFisher Posted May 29, 2008 Report Share Posted May 29, 2008 You can use it, your NS has a knock sensor and the PCM monitors it, if your engine knocks, the PCM will RETARD timing to stop the knocking... You can/may loose performance as a result, it might feel like a pig.. I run the middle grade all the time but I knock with regular in the heat and traffic Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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