I own a 1989 Mercedes Benz 560 SEL, I'm asking can I only put premium unleaded gas in it?

1989 MERCEDES BENZ 560SEL
121,000 MILES
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BLESSEDBYDABEST2012
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I do not own a manual so I do not know, have only been told what gas grade
Feb 24, 2012 at 2:45 AM
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