Is it necessary or advantageous to use premium fuel in a 1987 Mercedes SL 560?
It is not necessary to use premium fuel in a 1987 Mercedes SL 560. This model is designed to run on regular unleaded fuel with an octane rating of 87. Using premium fuel, which typically has an octane rating of 91 or higher, will not provide any noticeable benefit to the car's performance or engine life.