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...
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