Fuel type for a 1991 Mercedes 300SE?
Can you confirm if this is true?
If so, have I been damaging my car for all of these years running regular fuel?
What can I expect when I fill her up with premium?
Does the better mpg resulting from the better fuel offset the price difference?
Theres already about half a tank of regular fuel in it; should I just fill the rest up with premium resulting in two gases being in the tank at once?Will that matter?
Thank you very much.



