just-n-time here,my question is about octane rating,My loving wife has asked if she can put 87 octane in her 420sel,or dose she have to keep the high test
gas I told her to do what the instruction book said to do,She quickly quip well how do I know what the rating is in Germany! So I pose this to those who might know,some one help me set the Mizar straight.

There are no regular-gas Mercedes still on the road.

Well, some antique collectors may drive theirs occasionally.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

do a search on this... Tons of information on this site on Regular vs Premium.

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**A few Hondas etc... etc... Not Worth Mentioning**
83 Euro W126 380 sel Money Pit (Sold)
91 W124 300e 2.6. (Sold) 3.0 Motor is Much better!!
93 BMW E34 Touring Wagon (Sold) Sweet Car!!
91 300e (Just 200k with Ease.)Best car ever ???(Sold)
90 420sel (Black with Tan Interior) Best car ever!!!!!!!

It all says you have to use premium!

Here is a quote from the technical editor of The Star, the magazine of the Mercedes Benz Club of America:

Yeah, there's lots of discussion by any advice that regular fuel is usable is mistaken and just wishful thinking.

If you want to use regular fuel, get an American car.

That is, one with an oversize, slow-running, low compression engine.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

The octane number in Germany is the same as here.
RON ( Research Octane Number ) + MON ( Motor Octane Number ) : 2 = our rating system.
How do I know?..............Just filled up over there 2 weeks ago.

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2007 C 230 Sport.

My 85 380SE specifies use of 87 octane.

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95 E420 ( 76K) SOLD
85 380SE(125k)
95 SL500(72k)