Don - Just wanted to add that it is really a function of the compresson ratio of the engine. If your compression ratio gets up towards 10:1 it really should be running the good stuff. Most modern engines these days have knock sensors or detonation sensors that retard the spark when it begins to detonate to keep from damaging the engine. The late timing adversely affects performance and usually fuel mileage too. You might want to try the premium and see if running the cheaper price stuff is really worth it in the long run.
Barry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Marshall Booth Sent: Friday, January 20, 2006 12:37 PM To: Mercedes Discussion List Subject: Re: [MBZ] Premium Gas or Not? Donald Snook wrote: > I have not had a gas Mercedes since 1998 and it was a 1971 (that > originally ran on regular i.e. leaded gas), so I am not clear on the > premium gas requirement on newer gasser MB's. Do I really need to run > premium in my 1990 300SEL? I am pretty sure the simple answer will be > yes. Just wondering if anyone had thoughts on this issue. The M103 engine will run on less than premium, but will NOT run as it was intended to run. Marshall
