I just filled my 88 W124 up today. It was cold I was in a rush and by accident put regular gas in her (a full tank) Will this act of stupidity do any harm? Should us a octane booster????


All because the roads where dry and premium gas is 3 cents cheaper on Thursday

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88 300CE 300,000kms
Black Pearl, Burgandy Leather
Euro Lights.
Its for sale. Its SOLD

you fool! she's gonna blow any second!

I think you'll be alright this once. I read you might get some engine knock but I don't think there will be any permenant damage.

just don't do it again!

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

I now always put 87 in my car. After several long trips using 87 and 91 octane the mileage is the same and the engine has no trouble.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

my experience is those engines will usually take regular without TOO much trouble. if it doesn't ping it is fine

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currently just 1989 300SE 185k miles

One of the primary variables in the detonation equation is air inlet temperature. The hotter the inlet air, the more tendency to detonate, so there is less tendency to detonate in cold winter weather.

Listen for detonation. It is most likely at low revs and high load. Less likely at high revs, high load.

Since I only drive my 190E 2.6 during the winter, I use 87 PON. If I short shift and load up the engine too quick I get a little transient detonation, but I have learned to adjust my driving habits to avoid it.

Duke

87 - 91 - 93, They are all similar and those are minimum octane ratings. From what I have heard from the distributors, at most gas stations these are actually the same fuel. Amoco (BP) Ultimate is one that is truly different. I would recommend to anyone to try a couple tanks of the cheap stuff and see if you really notice a difference.

same fuel as in the same rating?

By the way LimeyB- let us know if you get any ill-effects with the regular gas...

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

Seems like my owner's manual says something like, "If you must use regular, do not drive at higher speeds/RPMs," or something to that effect.

What is that all about?

I thought the detonation danger was more at low RPM / high load?

I've used 87 for years, BTW. No problems.

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2012 E350
2006 Callaway SC560