Hi Donald,
I would use Premium fuel only and Mid Grade in a pinch.
Sure the computer will compensate for the lower octane but fuel mileage
and performance WILL suffer.
If you want to ask an expert go here:
http://www.agcoauto.com/content/submit-question
Ask Louis the question he will give you the correct skinny on it.
Or you can call him tomorrow @ 225-499-9526 between 10 and 11 AM CDT
www.wjbo.com on the net to hear his radio show.
I've known Louis for 20+ years and believe me he knows his stuff.
But he doesn't work on Merc's or Bimmers he sends them to my Indie.
Russ W.
84 300D
83 240D x2
On 7/22/2011 11:38 AM, Donald Snook 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 - b!
ut 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
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