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Originally Posted by 86560SEL
other 86' models on the internet and they do not say "premium only", but the 87's do.
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I'm not in the car right now but I'm positive our '86 420SEL says "premium unleaded only".
Checking one of the few books that came with the car (originally sold in California), on page 12 of the Maintenance Booklet for gas engines it says the 190 E 2.3 can use unleaded with an anti-knock index of at least 87 while all other models should use only premium unleaded with an anti-knock index of at least 91. It goes on to say engine damage could occur if premium fuel is not used and refers back to the Owner's Manual for special precautions (sorry, didn't get that book with the car...).