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2009 CTS4 2007 STS
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298 Posts
Discussion Starter #1
I purchased a 97STS about 3 weeks ago. The car is a beast and as of now I only use premium fuel. Is it necessary or just dealer recommended as of now I'm scared to use anything else?
 

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1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
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7,971 Posts
We have covered this a million times at least. Use the forum's search function for all the info you want and more.
 
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