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Discussion Starter · #1 ·
just curious, what fuel grade are you guys putting in your 6's?

the manul says mid grade is acceptable.
 

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1109 said:
just curious, what fuel grade are you guys putting in your 6's?

the manul says mid grade is acceptable.
I thought it called for "premium unleaded" gasoline with a "minimum octane rating of 91." What exactly does your manual say?
 

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Discussion Starter · #4 ·
you're right. mine says the same thing. "minimum octane rating is 91". some gas stations have 91 as mid-grade and 93 as prem. thanks.
 

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650iOzBoy said:
Shell Optimax from delivery day 1 using RON 98, no :bs: ethanol content :thumbup:
We are not as fortunate as you Lord Sidious. We have to burn some corn pone with our refined Texas sweet crude. However, we also have a different octane rating, so our 91 is something close to your 98 RON. I use Shell, too, but we do not have such a gasoline brand name as "Optimax." Sounds pretty optimizing (to the max, apparently). We have all kinds of additives in our fuel so that after it is burned the fumes waft into our wallets and float whatever money we have left into the coffers of the state and federal governments.
 

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Malibubimmer said:
We are not as fortunate as you Lord Sidious. We have to burn some corn pone with our refined Texas sweet crude. However, we also have a different octane rating, so our 91 is something close to your 98 RON. I use Shell, too, but we do not have such a gasoline brand name as "Optimax." Sounds pretty optimizing (to the max, apparently). We have all kinds of additives in our fuel so that after it is burned the fumes waft into our wallets and float whatever money we have left into the coffers of the state and federal governments.
That's right, I forgot to mention the conversion. 98 RON is about the same as 91 RON in the US. Optimax is just a fancy name. :) Read here:-

http://www.shell.com/home/Framework...rists/fuels/optimax/optimax_faqs_ga_1602.html

We also now get Shell Optimax Extreme 100 RON but with 5% ethanol. Bugger that ethanol sh!t !
 

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650iOzBoy said:
That's right, I forgot to mention the conversion. 98 RON is about the same as 91 RON in the US. Optimax is just a fancy name. :) Read here:-

http://www.shell.com/home/Framework...rists/fuels/optimax/optimax_faqs_ga_1602.html
The website makes it sound as if Optimax is the second coming:

So what do you need to know?

What is Shell Optimax?

Shell Optimax is a High Density, High Octane premium unleaded fuel. Shell Optimax is a highly refined high performance fuel which has been refined to a minimum of 98 RON. The fuel is produced from high-octane refinery component blending streams and has been carefully formulated to produce a fuel with high octane and good volatility characteristics to ensure smooth, rapid combustion.

In addition Shell Optimax contains a high performance fuel additive that has been designed to keep the fuel system and engine inlet system clean and free from deposits. The Shell Optimax formulation is designed to clean up deposits other petrols can leave behind.
:blah: :blah: :blah: :blah: :blah: :blah: :blah: :blah: :blah: :blah: :blah: :blah: :blah: :blah:
Translation: Refined petroleum + detergent additives. Sounds like gasoline to me. Do you guys have moonshine stills in the Outback selling gasoline at service statoins in the big cities? Sheesh.
 

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Manual States

91 Premium Octane. In the US 93 is available, try it.:p
 

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My usual fuel is Chevron premium, 93 octane. It has Techron a space age detergent additive which is designed to clean up deposits other petrols can leave behind.
 

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Techron

Oh that's the good stuff. Shell V-POWER has it too.
 

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Also pay attention to the amount of ethanol in the gas you use if u must use it.

SI B 13 01 06
Fuel System & Control March 2006
Technical Service

SUBJECT
Alcohol Fuel Blends in BMW Vehicles


MODEL
All with gasoline engines


SITUATION
Fuel blends containing a high percentage (above 10%) of alcohol, mainly ethanol, are becoming more commercially available. Customers inquire about the possibility of using alcohol fuels (e.g. E85) in BMW vehicles.

INFORMATION
Fuels containing up to and including 10% of ethanol or other oxygenates with up to 2.8% oxygen by weight, that is, 15% MTBE (methyl tertiary butyl ether) or 3% methanol plus an equivalent amount of co-solvent, will not void the applicable warranties with respect to defects in materials or workmanship.

Although, usage of such alcohol fuel blends may result in drivability, starting, and stalling problems due to reduced volatility and lower energy content of the fuel. Those drivability problems may be especially evident under certain environmental conditions, such as: high or low ambient temperatures and high altitude.

Only specially adapted vehicles (FFV - Flexible Fuel Vehicles) can run on high alcohol fuel blends. BMW, for the various technical and environmental reasons explained below, does not offer FFV models.

Usage of E85, or any other high alcohol content blend (e.g. E30) in BMW vehicles, will cause various drivability complaints (cold start problems, stalling, reduced performance, poor fuel economy, etc.), may cause excessive emissions, and may cause irreversible damage to engine, emission control and fuel delivery systems due to incompatibility of materials with alcohols.

General Notes Regarding E85 Fuel.

E85 fuel contains 85% (by volume) of ethanol and 15% of gasoline. Ethanol can be produced chemically from ethylene or biologically from grains, agricultural wastes, or any organic material containing starch or sugar. In the US, ethanol is mainly produced from corn and is classified as a renewable fuel.

Similar to gasoline, ethanol contains hydrogen and carbon; with additional oxygen molecules build into its chemical chain. This chemical structure makes ethanol's burning process slightly cleaner compared to the gasoline (lower tailpipe emissions).

On the other hand, due to lower carbon content, ethanol provides 27% less energy (for identical volume) then gasoline, resulting in the reduced fuel economy of E85 vehicles (approximately 22% higher consumption). Increased fuel consumption requires the appropriately enlarged fuel tank capacities (usually 30% increase), and the specific DME calibrations for the E85 lower Stoichiometric air/fuel ratio (10 compared to 14.7 for gasoline engines).

E85 fuel volatility is typically lower then gasoline (RVP 6-10 psi, compared to 8-15 psi for gasoline). Lower fuel volatility will reduce vehicle evaporative emissions, but it may cause cold starting problems especially with lower ambient temperatures.

Under certain environmental conditions, mainly lower ambient temperatures, ethanol separates from gasoline/alcohol mixture and absorbs water. The ethanol absorbed water molecules are heavier then gasoline or ethanol, they remain at the bottom of fuel tank and when introduced into combustion process they tend to form an extremely lean mixture resulting in misfire, rough idle and cold starting problems.

Certain materials, commonly used with gasoline are totally incompatible with alcohols. When these materials come in contact with ethanol, they may dissolve in the fuel, which may damage engine components and may result in poor vehicle drivability.

Some metals (e.g. zinc, brass, lead, aluminum) become degraded by long exposure to ethanol fuel blends. Also, some nonmetallic materials used in automotive industry such as: natural rubber, polyurethane, cork gasket material, leather, polyvinyl chloride (PVC), polyamides, methyl-methacrylate plastics, and certain thermo & thermoset plastics degrade when in contact with fuel ethanol.

In order to safely and effectively operate a motor vehicle running on E85, the vehicle must be compatible with alcohol use. Some manufacturers have developed vehicles called FFV (Flexible Fuel Vehicle) that can operate on any blend of ethanol and gasoline (from 0% ethanol and 100% gasoline, up to 85% ethanol and 15% gasoline). Ethanol FFVs are similar to gasoline vehicles, with main differences in materials used in fuel management and delivery systems, and DME control module calibrations. In some cases, also E85 vehicles require special lubricating oils.

Aftermarket conversions of gasoline-powered vehicles to ethanol-fueled vehicles, although possible, are not recommended due to internal materials and DME software incompatibility, as well, as the high costs of conversion.

WARRANTY INFORMATION
Components damage/malfunctions, or any drivability problems caused by use of fuels containing more then 10% ethanol (or other oxygenates with more then 2.8% oxygen by weight) will not be covered under BMW warranties with respect to defects in materials or workmanship.
 

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cobradav said:
WARRANTY INFORMATION
Components damage/malfunctions, or any drivability problems caused by use of fuels containing more then 10% ethanol (or other oxygenates with more then 2.8% oxygen by weight) will not be covered under BMW warranties with respect to defects in materials or workmanship.
Thank you Sir Launchalot, a very interesting read. I get paranoid about ethanol which is one of the reasons why I use the fuel that I use; 0% ethanol content.
 

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I use what ever the top grade is at Mobile .... because my XOM stock is killing it. Up a ton and loving the dividend checks!
 

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I heard the gas in most stations is fungible, that is, they all buy from the same refineries in general and the supplies are mixed. The detergent additives are fairly standard as long as you stick with the known brands and don't buy from Ivan the black market dealer at some no-name station which generally is watered down and has the meters all jacked so you pay for 10 gallons and get 6 only. We have a station like that here. I was using a 5 gallon race can and it only filled up to 4 gallons but I was charged 6 gallons!

Mal, there's a station in Pasadena that sells 100 Octane fuel for about $6+/gal. I use that in my race bike when I don't have the real 110 Octane race fuel that I am supposed to be using, but that is about $12/gal. Racing ain't cheap!
 

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Here BMW is specifying "european premium" RON98 for the 650i.
Some oil companies like Aral and Shell ("V-Max") are offering a RON100 fuel. Looks like it would start replacing the 98RON at some service stations.
 

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lawman800 said:
I heard the gas in most stations is fungible, that is, they all buy from the same refineries in general and the supplies are mixed.
There is a refinery in Memphis and you can see tankers from every distributor in the region (regardless of brand) pulling in to load. My understanding (subject to correction) is that differing brands have their additives put in when the tanker is loaded. Maybe they "inject" the additives into the filling pipe during the loading process.:dunno:
 
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