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

[Woodlandtaylors]

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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From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of XKEOTS at aol.com
Sent: Thursday, April 27, 2006 9:43 AM
To: mbcoupes at mbcoupes.com
Subject: [W126 Coupe] Fuel Requirements or How Can I Adjust 1989 560 SEC
ToUse 87 Octane

 

Hi All,

I am sure, any of us here in the USA, are not happy with the current fuel
prices. Also the fact that we have to use Super in our 560 SEC's.
I recently picked up a 1980 450 SL as it uses 87 octane and the mileage is
better than the 560. (I have no intention to sell my 560 SEC. It is the best
car that I have ever owned and I have owned over 100 cars)
Is there any way to make our 560's run or 87 octane?
I couldn't believe yesterday when I put in 12 gallons of fuel and it cost me
$42.00.
I was always under the impression that fuel injected cars need a lower
octane than carbs.
Any help or thoughts on this would be greatly appreciated.

Thanks
Jack Miller
1980 450 SL
1989 560 SEC



 

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