[W126 Coupe] Fuel Requirements or How Can I Adjust 1989 560SECToUse 87 Octane

[Richard Hogarth]

My MB dealer in Beaumont Tx claims that 89 octane is perfectly fine for our
cars. 
They say that 89 octane will not harm the engine in any way and its use has
been OK'd by the 
home office in Germany. 
I've been running 89 w/o problems. I don't hear any knocking and I don't
experience any
hesitation. I have noticed that I do get the best gas mileage when using top
octane fuels. 
Has Satish weighed in with an opinion ?
-RPH

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Mike R.
Sent: Thursday, April 27, 2006 1:00 PM
To: 'Mercedes Coupes Mailing Lists'
Subject: RE: [W126 Coupe] Fuel Requirements or How Can I Adjust 1989
560SECToUse 87 Octane



I've been running "middle grade" in my 560SEL for several months now with no
deleterious effects (yet). I do a couple tanks of middle, then one of
premium. Kinda trying to keep the gas in the tank mixed a little better than
middle grade. The key is don't run the level all the way down. The SEL is
primarily a town car with an occasional run down the freeway to get home
(<10 miles). Did a 50 mile run to Primm, NV via the freeways and filled up
with premium before I left.

 

Haven't done anything to the car for the lower grade gas and I've been
listening but haven't heard any pinging. Works for me.

 

Later,

Mike R.

 

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Woodlandtaylors
Sent: Thursday, April 27, 2006 10:31 AM
To: 'Mercedes Coupes Mailing Lists'
Subject: RE: [W126 Coupe] Fuel Requirements or How Can I Adjust 1989 560
SECToUse 87 Octane

 

I once read that the premium requirement was due to the fact that in the
80's lower grade fuel did not have the 'detergents' as part of the fuel.
These days all grades have them. Have a 420 that previous owner accumulated
265K miles on the car on 87 octane - I've used 91 in it have been tempered
to use lower, also have a 300CE use 91 in, but did try 89 a couple of times
no change was noted, however don't drive aggressively these days.

 

Dennis T

 


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