Changing Type of Gas
Changing Type of Gas
Newbie
Joined: Sep 2005
Posts: 20
Likes: 0
85 190E, 92 400E
read your manual. i read mine a little bit last night and i think it said; if you have to fill it up with regualar fill it half full. im not sure but i think with the 300e,400e,500e you can mix the gas 50/50, half premium and half regular.
Last edited by mrjd2636; Nov 20, 2005 at 06:27 PM.
Senior Member
Joined: Jan 2005
Posts: 314
Likes: 1
From: Bryson City NC
93 300SE Rauch "Smoke"
Been running RUL in my E420 V8 for well over a year with no problems. I live in the mtns. where you have lots of steep hills and long grades. Has yet to miss a beat! 
The only thing I do is pour in a can about once a month of SEAFOAM to keep the fuel system in top shape.
Smokie
http://www.seafoamsales.com/motorTuneUpTechGas.htm
The only thing I do is pour in a can about once a month of SEAFOAM to keep the fuel system in top shape. Smokie
http://www.seafoamsales.com/motorTuneUpTechGas.htm
Member
Joined: Mar 2003
Posts: 76
Likes: 0
From: Hedgesville, WV
1990 300E 2.6
If you do a search, you will find lots of opinions on octane requirements. MB says 91 (RON/MON) octane minimum. As an engine ages, carbon deposits build up in the combustion chamber increasing the compression ratio above the original 9.2:1. Older engines will often ping on a pull where they did not with fewer miles. It is always your choice but your older 124 does not have a knock sensor to automatically retard timing if the engine begins to knock on lower octane gas. It is theoretically possible to damage the engine if run like this for a long period of time. All "pinging" (detonation) is not clearly audible. An engine may be pinging slightly but not loud enough to be heard. Additives in higher octane gasoline control the burn rate of the gas, sort of evening out the burn rate of the fuel to avoid detonation. Gas in my area of the country is 87/89/93 octane. If you do half-fill mixes of 89/93 octane you will achieve an approximate 91 octane. With the 18 gallon tank in most 124s, you would save between $1.80 - $3.60 (depending on the cost difference between mid-grade and high-test) if the tank were bone dry. If you fill up with 18 gallons once every week, the yearly savings would be between $85 - $190. How much would it cost to repair a damaged engine? As has been said on many MB sites, many times, if you want an econobox that runs on the cheapest gas, buy one. The Benz was never designed to be such a car. I am not knocking a person's personal choice for their vehicle, just stating the facts you, as a young owner, should be aware of when making your choice.
MBWorld Fanatic!
Joined: Dec 2003
Posts: 1,016
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i drive on **** poor gas (california) and use 87 most ofthe time. sometimes i get a stumble off idle in which case i use 91 and a bottle of fuel injector cleaner, give her the old italian tuneup, and she is right as rain.
if you drive your car hard enough you will avoid/ preclude the carbon deposits.
if you drive your car hard enough you will avoid/ preclude the carbon deposits.
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MBWorld Fanatic!
Joined: Apr 2005
Posts: 2,849
Likes: 3
From: Long Beach, Ca
lots of cars
well i put 87 octane and my car ran like shiet so i would suggest spend the extra money and it's the same mile per gallon if you really look at. Also run your car from 55 to 90 for about 1/4 mile with some fuel injector cleaner. do this about twice a month.
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