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-   -   Unleaded or premium (http://forum.e46fanatics.com/showthread.php?t=971495)

jaswild 02-16-2013 10:13 PM

Unleaded or premium
 
Am I being uptight or should I only use premium in my E46? Is regular fine? I have been religious about using premium, but with the rise in gas prices...

j_block 02-17-2013 08:25 PM

Don't buy a bmw if your concerned about cheap gas

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TrippinBimmer 02-17-2013 09:20 PM

Premium or 100 OCT :eeps:

09f800st 02-17-2013 11:23 PM

Just for the sake of argument...I filled up the car with regular (87 octane), gave it to Wifey, and sent her to Portland on a shopping spree.
She came home with 418 miles on the car....averaged 34.6 miles per gallon.
I normally run premium, but I'm switching it up now and again, based on my own results. Yours may vary

36Daytona36 02-17-2013 11:43 PM

Isn't the peace of mind worth the extra $3 a tank?

TrippinBimmer 02-17-2013 11:44 PM

Quote:

Originally Posted by 36Daytona36 (Post 15172247)
Isn't the peace of mind worth the extra $3 a tank?

Yep, when motor start knocking. Say bye bye to motor :)

36Daytona36 02-17-2013 11:59 PM

I hate when people complain about having to put premium in. Its $3 more a tank in gas. Its suppose to give you better MPGs and burn cleaner in your engine. Think of all the things you dont need that you regularly buy and how much that costs.

peytonracer4 02-18-2013 12:10 AM

Quote:

Originally Posted by 36Daytona36 (Post 15172270)
I hate when people complain about having to put premium in. Its $3 more a tank in gas. Its suppose to give you better MPGs and burn cleaner in your engine. Think of all the things you dont need that you regularly buy and how much that costs.

No kidding. Wtf.
"Hey guys. So I'm trying to find ways to save $4.56 a month. Is it totally cool if I use unleaded against bmws recommendation? I plan on starting a college fund for my kids with the saved money."

jaswild 02-18-2013 12:57 AM

Wow, sorry to get your panties in a bunch guys. I found the thread I should have read first before having to deal with your opinions... I'll do better digging next time before I prod old wounds.

09f800st 02-18-2013 07:31 AM

It's a tough crowd to be sure...Gotta have thick skin if you want to keep your sanity
But there are some misconceptions;
First...premium burns no more dirty or clean than any other octane rating.
Premium and regular both create the same amount of energy when burned. Premium just burns slower allowing for higher compression and more advanced timing, which in turn allows for more horsies from your car.
The simple answer is that if the manufacturer says use premium, then that's what you should use. Will your motor blow with regular? NO

GTB323 02-18-2013 08:32 AM

Correct me if I'm wrong but doesn't premium "burn more complete" therefore leaving less cArbon buildup in your engine?

09f800st 02-18-2013 08:36 AM

That's a misconception

Gasoline pumps typically post octane numbers as an average of two different values. Often you may see the octane rating quoted as (R+M)/2. One value is the research octane number (RON), which is determined with a test engine running at a low speed of 600 rpm. The other value is the motor octane number (MON), which is determined with a test engine running at a higher speed of 900 rpm. If, for example, a gasoline has an RON of 98 and a MON of 90, then the posted octane number would be the average of the two values or 94.

High octane gasoline does not outperform regular octane gasoline in preventing engine deposits from forming, in removing them, or in cleaning the engine. Consumers should select the lowest octane grade at which the car's engine runs without knocking. Occasional light knocking or pinging won't harm the engine, and doesn't indicate a need for higher octane. On the other hand, a heavy or persistent knock may result in engine damage.

Brevik 02-18-2013 08:43 AM

I ran unleaded 87 octane in my 323ci for years with no issues and averaged 30 mps the whole time, however I do use 93 octane in my M3.

BMWCaptain 02-18-2013 09:01 AM

Definitely should use UNLEADED! All BMWs use Unleaded. I am not even sure anyone sells Leaded fuel anymore.

e46jki44 02-18-2013 09:14 AM

Quote:

Originally Posted by BMWCaptain (Post 15172809)
Definitely should use UNLEADED! All BMWs use Unleaded. I am not even sure anyone sells Leaded fuel anymore.

Most gas with octane levels over 100 is leaded but is only for offroad use and on cars with no catalytic converters.

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BMWCaptain 02-18-2013 09:24 AM

Quote:

Originally Posted by e46jki44 (Post 15172824)
Most gas with octane levels over 100 is leaded but is only for offroad use and on cars with no catalytic converters.

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Where do they sell 100 octane?

peytonracer4 02-18-2013 11:12 AM

Quote:

Originally Posted by BMWCaptain (Post 15172836)
Where do they sell 100 octane?

There's a station near me that sells 100. Not sure if its leaded because I've never really look at it

e46jki44 02-18-2013 01:23 PM

Quote:

Originally Posted by BMWCaptain (Post 15172836)
Where do they sell 100 octane?

A few gas stations have 100 near me. It is still unleaded. When you get into higher octanes like 110 and up it can be found at race tracks.

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genuity 02-18-2013 08:39 PM

The engine was designed for 91 octane. Just use what was recommended by the manufacturer. Penny pinchers need not apply but consider it the BMW "tax." :shhh: I think we have all been down this road at one point or another to either have not filled up with premium or have thought about it. You have to pay to play, right? :4ngie:

Read these:

http://www.caranddriver.com/features/regular-or-premium

Stan Baldwin, BMW Spokesperson - Running On Regular: Do Premium Vehicles Really Need Premium Gasoline?

http://www.roadandtrack.com/car-news...m-fuel-futures

09f800st 02-18-2013 09:22 PM

It's the same thing I just said...only waaaay more wordy. I don't work for Car and Driver, but I did stay in a Holiday Inn last night


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