MB Dude's article said: Model year 1986. All gasoline engine models, except the 190E 2.3 require premium unleaded gasoline
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I have a 1986 560 SEL with 156K miles. This car has had nothing but regular unleaded fuel and it runs fine, gets decent mileage and has had no engine problems. That being said, if you drive your MB hard and fast or pull a trailer or do things that put the engine under heavy load, premium fuel is the way to go. But for normal everyday driving you can use regular unleaded.

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1986 560 SEL (159K miles)