I was given a C 300 for a loaner while they do a B sevice on my ML.

I need to put a little fuel in her before bringing it back.

Is High Test required??

Thanks in advance

BTW.... Nice Car

 

You should use premium for optimum performance. The engine's knock sensors won't really allow any damage if you put lower octane fuel in but the timing may be retarded enough to lose a little power.
No real worries but the next guy in the loaner might think it's a little slow.

 

I'll go w/ the 93+ Thanks for your help.

 

It doesnt really matter. I doubt most people put 93 in that car before they return it.