I think you need a new mechanic, the 103 104 and later cars need at least 91 to run right. They say you have to run premium in the 420 and 560 but you can actually get away with regular in those cars.
Sent from my iPhone On Jul 22, 2011, at 11:38 AM, Donald Snook <dsn...@mtsqh.com> wrote: > Craig wrote: "Both the E420 and E320 require premium, so that's a wash. But > thank you > for thinking of it." > > Not that I want to start a premium fuel thread (or maybe I do! :) ), but do > they really require premium? My indy was very upset with me when I told him > I always put Premium in the E320. He said the car doesn't need it. I told > him the owner's manual says it needs it, Mercedes says it needs it and the > fuel filler door says premium only. He says that the car is equipped with a > knock sensor and is you use 87, the computer will compensate for the lower > grade and it will run just fine. I know he is correct that the car has a > knock sensor and probably the computer will compensate, but is that really > desireable? I mean, if it was designed to run on premium do we really want > to have the computer compensating and lowering performance? Is it really > "designed" to run on premium? In other words, is there some detrimental > effect on the car running 87 all the time and having the performance > affected? (by the way, I think I just used both effect and affect correctly > in a sentence - but not sure). > > My BMW manual says that 91 should be used. But, it specifically says that the > computer will compensate for lower octane, but not to go below 87. > > Donald H. Snook > _______________________________________ > 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://mail.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://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
