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7 Series - E65 / E66 (2002 - 2008)
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  #26  
Old 05-15-2008, 05:14 AM
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Joe-BMW Joe-BMW is offline
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Last night I went to fill up and mistakenly hit the mid-grade 89 octane option. I realized this when I was killing time looking at the gas prices on the board and saw $4.06 for premium and looked at the pump which was pumping at $3.99 per gallon. Probably put in about two gallons and then switched up to the 93 octane. Luckily I had an ampty tank. So 2 gallons at 89 and about 20 gallons at 93. This all made me think that the manual states 92 octane as the required gas. If you are really cheap and a good mathematician, I bet you could blend down to 92! LOL.
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  #27  
Old 05-15-2008, 03:26 PM
dekdeavs dekdeavs is offline
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Quote:
Originally Posted by ffej View Post
There's a 76 station on Almaden Expressway, near Capitol Expressway that sells 100 octane. That won't do you any good, though, either. You could do a blend of 25% 100 octane and 75% 91 and you'll be running ~93...
Why wont that do any good?
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  #28  
Old 05-15-2008, 03:45 PM
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erunithug erunithug is offline
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Originally Posted by dekdeavs View Post
Why wont that do any good?
a car wont benefit from a really high octane unless is specifically designed to use that high octane. so putting 100 octane in a car that is supposed to run on 92 wont do u any good...

heres a thread discussing high octane in a regular street car:
http://www.bimmerfest.com/forums/sho...ht=high+octane
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Last edited by erunithug; 05-15-2008 at 03:50 PM.
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  #29  
Old 05-15-2008, 04:08 PM
dekdeavs dekdeavs is offline
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Quote:
Originally Posted by erunithug View Post

heres a thread discussing high octane in a regular street car:
http://www.bimmerfest.com/forums/sho...ht=high+octane
Gotcha, thanks for the link! I guess i'll stick to 91 octane.
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  #30  
Old 05-15-2008, 08:41 PM
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kemosobe77 kemosobe77 is offline
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For those of you in NY beware. Many gas stations have been cought in the last couple of weeks selling regular gas as super. Think about it....We never actually see the gas or the tank that iit s coming from...silver for instant is a mixture of regular and supper, mixed at the pump. Best thing to do as not to get robbed is keep track of your milage and gallons used. My brother figured out a local station was doing this because his mpg dropped a lot with that gas....
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  #31  
Old 05-16-2008, 12:05 AM
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erunithug erunithug is offline
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Originally Posted by kemosobe77 View Post
For those of you in NY beware. Many gas stations have been cought in the last couple of weeks selling regular gas as super. Think about it....We never actually see the gas or the tank that iit s coming from...silver for instant is a mixture of regular and supper, mixed at the pump. Best thing to do as not to get robbed is keep track of your milage and gallons used. My brother figured out a local station was doing this because his mpg dropped a lot with that gas....
i dont understand how gas stations can sell regular as super the gas station has nothing to do with what gas goes in what tank. when the truck delivers its gas, it dumps it in the corresponding underground tanks. there is no way the driver of that trunk will put the regular gas in a super tank.
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  #32  
Old 05-16-2008, 05:19 AM
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I didnt understand it either untill I spoke to a buddy who owns a gas station. It seems that the gas station has the ability of telling the pump what tank to take the gas from. So...if the pump is told to pull gas from the "regular" tank when you push the "super" button than that is what you get. Here in LI consumer affairs is going around testing the octane of all 3, regular, silver and super....You would be suprice what people in NY do to make a buck! With prices so high "anything goes" seems to be the norm. This winter a heating oil company got busted for stealing oil from senior citizens centers (i.e not delivering it and billing for it) and selling it on the black market to gas stations. Heating oil is the same as diesel. Over $5.00 a gallon in NY. It seems that with the soft economy more and more people are looking to make a quick buck!
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  #33  
Old 05-16-2008, 06:56 PM
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erunithug erunithug is offline
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the gas station has the ability to change the mix ratio of the gases, but even if they did that, it would catch up with them when they get audited by the state.
is "silver" an east coast thing or just a NY thing? ive never heard of it referred to it as silver.
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  #34  
Old 05-17-2008, 07:41 AM
745ByMySide 745ByMySide is offline
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I think the pump mixes the blend when you hit the button, I doubt they deliver three different octanes.
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  #35  
Old 05-17-2008, 11:54 AM
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erunithug erunithug is offline
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Originally Posted by 745ByMySide View Post
I think the pump mixes the blend when you hit the button, I doubt they deliver three different octanes.
they deliver 2 types. Super and regular (well 3 if they have diesel). theyre mixed at the pump for mid grade.
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  #36  
Old 05-19-2008, 04:26 PM
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stick with min 91
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  #37  
Old 06-01-2008, 03:02 PM
sureshmysore sureshmysore is offline
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My grade depends on temperature

Got car last fall with winter coming soon(temperature drops to -40 and colder) and found out that the 750Li does not have block heater capability at all. Found it impossible to put oil pan heater and difficult to put battery heater.
So used 87 gas when it was cold ( may not burn evenly like premium gas but it BURNS - well more like explodes I guess) and had no problem.
When regular temp use 89 gas.
When hot ( average temp 25 or above - switch to 91 gas - the highest we get.)
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  #38  
Old 06-01-2008, 10:39 PM
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Playdrive4me Playdrive4me is offline
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You can use whatever gas you want. Be advised however that just like BMWs magical 100K Mile transmission fluid intervals, just because the manual SAYS it's ok doesn't mean that it IS ok.

In fact, as the manual very clearly states, that "temporary" knock or ping you hear at startup or shut down is the short period of time in which the car's computer hasn't "caught up" with the lower mixture and adjusted the timing accordingly. Over MANY years ( if you plan to keep the car for along time) this premature detonation can start to cause damage to the piston heads and all kinds of nasty unseen damage.

That doesn't mean I'm the model of perfection though, most of the time I alternate between mid-grade and premium but NEVER NEVER NEVER regular!

The *ONLY* reason I even consider using mid-grade as I have stated before, has nothing to do with the COST of the fuel, it is the principle because alot of CRAPPY independent gas stations RAISE the price of Premium by as much as FIFTY cents over regular for NO GOOD REASON whatsoever. Whenever I come across this bullsh!t I say f**k it and pump mid-grade. I really hate it.
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Last edited by Playdrive4me; 06-01-2008 at 10:41 PM.
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