Mixing Gas - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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#1 (permalink) Old 05-01-2005, 02:07 PM
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is it bad? does any one use 87 or 89 octane on their bmw?

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#2 (permalink) Old 05-01-2005, 03:25 PM
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I believe the lowest you should go is 89... but check owners manual.

Yeah, even with 87 the engine can retard the timing, but it's not good.

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#3 (permalink) Old 05-02-2005, 12:04 PM
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Quote:
Originally posted by Torque@May 1 2005, 01:25 PM
I believe the lowest you should go is 89... but check owners manual.

Yeah, even with 87 the engine can retard the timing, but it's not good.
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I usually use Ethanol gazoline in my 525i. in canada, ethanol is mixed at 7% and helps cleans the engine(pistons, injectors, fuel filter) while driving and keeps the environment safer.

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#4 (permalink) Old 05-02-2005, 01:18 PM
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Since filling up my 528 now cost more then my morgage payment, I switched to 87 and havn't noticed a thing. I even get the same gas milage. I dont know if this is a good thing, but Its better then paying $60.00 for a fill up
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#5 (permalink) Old 05-02-2005, 03:57 PM
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Quote:
Originally posted by tacroteau@May 2 2005, 11:18 AM
Since filling up my 528 now cost more then my morgage payment, I switched to 87 and havn't noticed a thing. I even get the same gas milage. I dont know if this is a good thing, but Its better then paying $60.00 for a fill up
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87 is too low for an octane level....you might hear some ping in the engine....don't forget, the lower your octane level, the more volatile it is and the more deposit of carbon you will have on your pistons...AND, regular gazoline is mixed with water...you don;t want that in your engine...I would opt for a higher octane for a BMW...heck the car is expensive as it is....
my $0.02
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#6 (permalink) Old 05-08-2005, 03:36 AM
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Im running 98 Octane.

I was running it on 91 for a while... well not me, my mum...

It runs much better now!
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#7 (permalink) Old 05-08-2005, 08:19 AM
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Use what the owners manual says is required. Remeber that the octane rating on our US Pumps is in AKI (Anti Knock Index) and the European standard is RON (Research Octane Number). Example, 91 RON is equivalent to 87 AKI.
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#8 (permalink) Old 05-08-2005, 12:08 PM
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Quote:
Originally posted by tacroteau@May 2 2005, 01:18 PM
Since filling up my 528 now cost more then my morgage payment, I switched to 87 and havn't noticed a thing. I even get the same gas milage. I dont know if this is a good thing, but Its better then paying $60.00 for a fill up
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Well I also have a 528i and actually i usually put in 87 here in the US. The reason is not only beacuse of the gas prices but beacuse its not necessarily required for a higher octante. But dont get me wrong tho because i ALWAYS let the car run jsut about out of gas at some point (usually once or twice a month) and fill up the beaut with the highest octane level i can get. This helps keep the insides clean while saving me money! B)
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#9 (permalink) Old 05-08-2005, 01:45 PM
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Quote:
Originally posted by rakeshp+May 8 2005, 12:08 PM--><div class='quotetop'>QUOTE(rakeshp @ May 8 2005, 12:08 PM)</div><div class='quotemain'><!--QuoteBegin-tacroteau@May 2 2005, 01:18 PM
Since filling up my 528 now cost more then my morgage payment, I switched to 87 and havn't noticed a thing. I even get the same gas milage. I dont know if this is a good thing, but Its better then paying $60.00 for a fill up
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Well I also have a 528i and actually i usually put in 87 here in the US. The reason is not only beacuse of the gas prices but beacuse its not necessarily required for a higher octante. But dont get me wrong tho because i ALWAYS let the car run jsut about out of gas at some point (usually once or twice a month) and fill up the beaut with the highest octane level i can get. This helps keep the insides clean while saving me money! B)
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Or you could just go midgrade all the time and still be spending the same amount of money...

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#10 (permalink) Old 05-08-2005, 04:40 PM
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Quote:
Originally posted by backindauk@May 8 2005, 01:36 AM
Im running 98 Octane.

I was running it on 91 for a while... well not me, my mum...

It runs much better now!
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were do u live? i live in canada and the most ive seen is 94 octane. ive been told no gas stations near me wanna go higher than that octane wise

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#11 (permalink) Old 05-08-2005, 05:45 PM
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Lol guys I hate to be mean, but octane ratings aren't that complicated, you should try looking it up sometime.

Ok let's begin:

1) Regular grade gasoline is not mixed with water. Water and gasoline won't mix, they're different weights and will just make a suspension. If you really think there's water in your gasoline, then pour it into a container that you can see in, and look for any seperation, layering, or beads of other liquids on the surface. Then don't use that gasoline if it has any of those

2) Lower octane gasoline does not produce more carbon buildup on the inside of your engine. Using too high of an octane actually will because the higher the octane number the slower the fuel burns.

3) The octane rating does not mean, well anything that I've seen mentioned on here so far. I recommend you go to howstuffworks.com for the best explanation on this one, but basically the octane rating is the percentage of the gasoline that is actually Octane (for example: 87% Octane / 13% Heptane). Oh and Octane handles compression better than heptane, but is more expensive. And yes I know obviously you can't have 115% Octane fuel, but the octane rating has matured into more of an equivelency chart... so anything that handles compression as well as the matched rating is ok. 115 octane fuel has lead added to it and therefore handles compression better than 100% octane fuel.

In short, use what your manual says. If you use too low octane than you get knocking because the fuel is exploding from compression before the sparkplug ignites. If you use too high of an octane rating then it burns too slow leaving you with unburnt fuel left in the cylinders.

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#12 (permalink) Old 05-08-2005, 06:33 PM
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gas is gas.
mixing doesnt matter...to get 89, they mix 87 and 91..
i would use what the manual says..but your car wont die because you are using something other than what the manual says...

the engineers that make engines realize that not all countries mix 91 or whatever fuel..so they make their engines able to run on whatever octane rating well.

!
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#13 (permalink) Old 05-09-2005, 12:56 AM
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if you got a bimmer, you expect to pay some $$$ for maintenance such as premium gas. So stop whining, and if you won't put at least 89 in your bimmer, just sell it because you're not worth it.


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#14 (permalink) Old 05-09-2005, 09:29 AM
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Quote:
Originally posted by superdeadman@May 9 2005, 12:56 AM
if you got a bimmer, you expect to pay some $$$ for maintenance such as premium gas. So stop whining, and if you won't put at least 89 in your bimmer, just sell it because you're not worth it.
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#15 (permalink) Old 05-09-2005, 09:33 AM
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Quote:
Originally posted by superdeadman@May 9 2005, 12:56 AM
if you got a bimmer, you expect to pay some $$$ for maintenance such as premium gas. So stop whining, and if you won't put at least 89 in your bimmer, just sell it because you're not worth it.
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right... that must be it, Maybe we just cut corners WHEN WE CAN My BMW isnt my only toy I need to pay for.

I am running on grape juice 49 cents per gallon (exhaust smells good too)

Not to be an ass, but why not mix your gas with a box of pencils (they will blend together as well as gas with water) :nana
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