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      12-25-2012, 11:01 AM   #1
sochermit
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Fuel Separation

Should I be adding some sort of enzyme that prevents fuel separation? I have been reading about "Star Tron" and was just wondering. I see where they, the govt., is introducing E15 which is not covered by manufacturers warranty. Whats you opinion?
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      12-25-2012, 12:40 PM   #2
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I have only used fuel additives when the engine isn't run regularly or when the tank of fuel will last for a long time, but I'm talking months here.
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      12-26-2012, 01:29 AM   #3
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E15 is fine. Fuel additives/treatments should only be used when the vehicle is being stored for more than a couple weeks at a time.
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      12-26-2012, 08:09 AM   #4
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Testing

Quote:
Originally Posted by Ćnema View Post
E15 is fine. Fuel additives/treatments should only be used when the vehicle is being stored for more than a couple weeks at a time.
I have read several articles like this, http://laurenfix.blogspot.com/2010/0...-new-font.html, and will wait for more testing before I would go with E15.

I believe that I saw an article that said BMW, among other manufacturers 8 or 9, the warranty would be invalid if e15 was used.

I just do not trust the government.
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      12-26-2012, 12:39 PM   #5
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Quote:
Originally Posted by sochermit View Post
I have read several articles like this, http://laurenfix.blogspot.com/2010/0...-new-font.html, and will wait for more testing before I would go with E15.

I believe that I saw an article that said BMW, among other manufacturers 8 or 9, the warranty would be invalid if e15 was used.

I just do not trust the government.
I wouldn't trust that article for 1/2 a second.

Pump gas is already 10% ethanol and all cars manufactured in the 10-12 years have been designed with a higher blend than this in mind. Brazil actually runs 20%+ mixes year round and there is no difference between USDM bimmers and the ones sold in Brazil. The ethanol attacks certain plasticizers but those plasticizers aren't present in the N54 fuel system.

Fuel mileage will suffer slightly, ethanol is less dense and burns at a lower stoich(~8:1 compared to 14.7:1) however, at just a 15% mix it's negligible.

A 15% blend will not affect cold starts, nevermind cause it to not start. At 50% or higher mixes I've some people complain of rougher starts but there's a BIG difference between 15% and 50%.
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      12-26-2012, 02:11 PM   #6
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I have been told by technicians that using an ethanol tester for fuel, anything over E20 is cause for alarm for them. Under that and it's "normal." I had asked this question for E85 blend reasons however.
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