Here is all that I have to say on this subject... You drive a Mercedes-Benz. These cars are designed to run on gasoline that is much better than the goat's piss we can even get in the US. It costs what, $3-5 more per tank for premium? Much less expensive than the havoc the cheap fuel is placing on your injectors, ignition system, and even your rings at a minimum.
The only MB I run on regular is the Unimog. It gets 12 mpg on a good day and has a 7.8:1 compression ratio. Your poor m103 with a 9 or 10 :1 CR, no wonder it is pinging! An no, there is not a knock sensor on that motor (at least the early ones). They will ping until they crack a ring and melt a piston. Look at the m100 (6.3) rebuild pictures on my website. That is what a lean mixture and advanced timing will do for you. Not much different than running crap fuel in a high compression motor. In the end one always pays... sooner (good fuel) or later ($$$ to your mechanic and parts dealer). If you can't afford to feed your MB good fuel, you should be driving a Toyota or Honda. Mathieu www.oldworldauto.com > -------Original Message------- > From: Tony Wirtel <tony.wir...@gmail.com> > Subject: Re: [MBZ] Premium v. Regular > Sent: 31 Dec '08 02:22 > > Does the M103 have a knock sensor? I didn't think they did. Mine pings big > time with 87. > > Tony Wirtel > > > > > -----Original Message----- > > From: Donald Snook <dsn...@mtsqh.com> > > Date: Tuesday, Dec 30, 2008 11:54 am > > Subject: [MBZ] Premium v. Regular was Re: Fuel prices > > To: 'Mercedes Discussion List' <mercedes@okiebenz.com>Reply-To: Mercedes > > Discussion List <mercedes@okiebenz.com> > > > > Andrew wrote: "Do you require premium or regular gas?" > > > > > >That is up in the air right now. The manual says premium, the fuel > > cap/door say premium. But, I have asked a few others that have this car > and > > some of them say it needs premium and others say it is a waste of money. I > > have not noticed any difference in mileage or performance when using 87 > > octane. I was concerned that it might "ping" but it has not. I don't know > > what to think, so I have been putting in 91 (premium) about every other > > tank. > > > > > >I talked to one of the techs at the dealership I worked at and he said > > that if the octane is too low and it starts to ping, the knock sensor will > > catch it and it will retard the timing slightly to compensate for it. So, > > it is possible that I might have less power with 87 than with 91. I don't > > really know what to think. In the past (especially in my 90 300SEL), I > > thought I could tell a difference when I put in 87 rather than 91. Maybe I > > was just imagining it. > > > > > > > > >Donald H. Snook > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20081230/5fc9e10d/attachment.html> > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
