Should I be putting premium gas in my 325I?

acblue94 · 10-16-2007, 02:55 PM

Is it neccessary to be putting premium gas in my 325I? Whats the big difference between gases?

OC Guy · 10-16-2007, 02:56 PM

About 10 cents per 2 octane. Don't be cheap.

BMdblU · 10-16-2007, 03:03 PM

Cheap gas is garbage. Whatever it says on the inside on the fuel cap is what you should be putting in.

PatsE92 · 10-16-2007, 03:11 PM

IBTL

Pat

GregL · 10-16-2007, 03:13 PM

Put in premium. Whatever you think you'll save in the cost per litre/gallon between 87 and 91, you'll end up losing more in poorer fuel economy.

SteveMD · 10-16-2007, 03:20 PM

Use what is recommended.

It doesn't say 'Premium' in the owners manual just to piss you off.

A higher octane represents a higher resistance to detonation. If you use a lower octane gasoline in an engine designed for premium, the ECM will retard the timing and you performance and economy will suffer.

Conversely, there is generally no advantage to putting premium in an engine designed for regular. You may (or may not) get some additives that aren't in regular but you won't be going any quicker unless you play with the ECM.

ScBlacksunshine · 10-16-2007, 03:21 PM

325 is so slow and crappy you should just use vegetable oil instead

acblue94 · 10-16-2007, 03:23 PM

Well ive always been putting premium, but i lend the car to my dad for 3 days and he put $10 worth of unleaded. After that he told me that he filled it up with premium when I found out. It was only one time...

///M3NACE · 10-16-2007, 03:27 PM

no put in diesel..its makes you go fastttt

MadDog · 10-16-2007, 04:10 PM

Quote:

Originally Posted by acblue94

Well ive always been putting premium, but i lend the car to my dad for 3 days and he put $10 worth of unleaded. After that he told me that he filled it up with premium when I found out. It was only one time...

All gas is now unleaded. Putting $10 of regular gas into your car once shouldn't hurt it.

acblue94 · 10-16-2007, 04:22 PM

I mean 87 octane..I put only once..

LOLrance · 10-16-2007, 04:38 PM

Quote:

Originally Posted by ihsanshaik

no put in diesel..its makes you go fastttt

+1, your flux capacitor will last longer with diesel too.

AndrewAZ · 10-16-2007, 04:40 PM

Lets just say if you ever have an engine issue and it goes to the dealer and they decide to test your gas and they find you are not using the recommended fuel bam your warranty is void. So if you really think its worth saving $2 every fill up then go for it, it might end up costing you in the long run if you have an issue.

epiphone3 · 10-16-2007, 04:46 PM

Quote:

Originally Posted by acblue94

Is it neccessary to be putting premium gas in my 325I? Whats the big difference between gases?

YES! Put in premium for goodness sakes!

Your car is equipped with cylinder-specific knock control. This means that when you put in a gasoline with lower octane, the computer will retard the ignition timing to prevent knock. This means you will have less performance and WORSE FUEL MILEAGE.

Long story made short --> Using Premium will cost you the same as using Regular gas due to better gas mileage from premium and your car will be much more enjoyable with premium gas. Also, the long term health of your engine will be better with premium.

fotoguy335 · 10-16-2007, 07:01 PM

Lets see, we spend $38K+ on a car then a bunch more $$ on upgades and mods, and dont want to spend an extra $4.00 for a tank of gas...something doesnt add up

阿龍|ah_Long · 10-16-2007, 07:04 PM

ok... use water

uberschnell · 10-16-2007, 07:07 PM

Regular unleaded blended with 2-stroke oil, about 1 quart for every 10 gallons should work.

John 070 · 10-16-2007, 07:24 PM

Quote:

Originally Posted by GregL

Put in premium. Whatever you think you'll save in the cost per litre/gallon between 87 and 91, you'll end up losing more in poorer fuel economy.

No, the "poorer fuel economy" is an urban myth that just wont go away, not even when a petroleum co. tries to do its due diligence (they are making so much money nowadays it would be robbery to not try to dispell myth and do something to save consumers $$$).

But, BMWs were designed for premium, so the simple answer is to use it. Someday everyone will be like the 2k8 CTS and deliver the 300+ HP while being designed for 87.

bufasion · 10-16-2007, 07:48 PM

Quote:

Originally Posted by AndrewAZ

Lets just say if you ever have an engine issue and it goes to the dealer and they decide to test your gas and they find you are not using the recommended fuel bam your warranty is void. So if you really think its worth saving $2 every fill up then go for it, it might end up costing you in the long run if you have an issue.

87 octane is specifically allowed for 323/325/328s (read the manual). It can't void warranty.

flicks28 · 10-16-2007, 08:22 PM

Quote:

Originally Posted by epiphone3

YES! Put in premium for goodness sakes!

Your car is equipped with cylinder-specific knock control. This means that when you put in a gasoline with lower octane, the computer will retard the ignition timing to prevent knock. This means you will have less performance and WORSE FUEL MILEAGE.

Long story made short --> Using Premium will cost you the same as using Regular gas due to better gas mileage from premium and your car will be much more enjoyable with premium gas. Also, the long term health of your engine will be better with premium.

+1000.

John 070 · 10-16-2007, 08:24 PM

Quote:

Originally Posted by bufasion

87 octane is specifically allowed for 323/325/328s (read the manual). It can't void warranty.

You are correct. The amount of misinformation given on this forum is alarming, because often the OP is earnestly asking a question, thinking he is getting an answer from experts.

The 328 is 87 and the 335 is 89 minimum. But it was designed for super, so there is a benefit to using super. If it were an '08 CTS with direct injection, the car was designed for 87 (beautiful), so there would be zero benefit to using 91 or 93.

Frank ZZR · 10-16-2007, 08:54 PM

Do as I did. Test mpg for both regular and premium. Then choose a long straight hill and test for top speed at the top with both fuels. This will give you some indication as to what power gain or loss you have with each fuel. Then decide which fuel you should use. The results will save you money. BTW... regular is acceptable in a 325/328 and will NOT void your warranty.

10-16-2007, 02:55 PM	#1
acblue94 Private First Class 9 Rep 109 Posts Drives: 325i Join Date: Aug 2007 Location: Miami iTrader: (0)	Should I be putting premium gas in my 325I? Is it neccessary to be putting premium gas in my 325I? Whats the big difference between gases?
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10-16-2007, 02:56 PM	#2
OC Guy General 539 Rep 18,123 Posts Drives: AW 335D E90 Join Date: Oct 2006 Location: Irvine/Aliso Viejo, CA iTrader: (9) Garage List 2007 335i [0.00]	About 10 cents per 2 octane. Don't be cheap. __________________ Current: 2010 Alpine White 335D LCI l 19" BBS LMs l KW V2 Coilovers l BMW Performance Grilles l MSport Front/Rear l Karbonwerke Trunk l F1 Pinnacle Tint 35% Former: E92 Space Grey 335i Latest pics
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10-16-2007, 03:03 PM	#3
BMdblU Brigadier General 152 Rep 3,983 Posts Drives: F80 Join Date: Oct 2007 Location: Toronto iTrader: (2)	Cheap gas is garbage. Whatever it says on the inside on the fuel cap is what you should be putting in.
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10-16-2007, 03:11 PM	#4
PatsE92 Private 4 Rep 99 Posts Drives: 2010 E92 M3 Join Date: Oct 2006 Location: Lafayette, LA iTrader: (0)	IBTL Pat __________________ ____________________________________________
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10-16-2007, 03:13 PM	#5
GregL Brigadier General 98 Rep 3,618 Posts Drives: 2016 CLA45 AMG Join Date: Nov 2005 Location: GTA iTrader: (4)	Put in premium. Whatever you think you'll save in the cost per litre/gallon between 87 and 91, you'll end up losing more in poorer fuel economy. __________________ 2016 Mercedes-AMG CLA45 2013 Mercedes-Benz B250 - Gone 2010 Mercedes-Benz C350 4Matic - Gone 2006 BMW 330xi - Gone 2001 Infiniti QX4 - Gone
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10-16-2007, 03:20 PM	#6
SteveMD Colonel 198 Rep 2,485 Posts Drives: 2016 F10 535i MSport Join Date: Dec 2005 Location: Raventown! iTrader: (3)	Use what is recommended. It doesn't say 'Premium' in the owners manual just to piss you off. A higher octane represents a higher resistance to detonation. If you use a lower octane gasoline in an engine designed for premium, the ECM will retard the timing and you performance and economy will suffer. Conversely, there is generally no advantage to putting premium in an engine designed for regular. You may (or may not) get some additives that aren't in regular but you won't be going any quicker unless you play with the ECM. __________________ 2006 E90 330i (retired) 2009 E90 335i (retired) 2012 E70 X5 50i M Sport (retired) 2016 F10 535i M Sport
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10-16-2007, 03:21 PM	#7
ScBlacksunshine YUGO is my dream car 144 Rep 1,564 Posts Drives: Bayerische Motoren Werke Join Date: Mar 2006 Location: LBC iTrader: (2)	325 is so slow and crappy you should just use vegetable oil instead __________________
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10-16-2007, 03:23 PM	#8
acblue94 Private First Class 9 Rep 109 Posts Drives: 325i Join Date: Aug 2007 Location: Miami iTrader: (0)	Well ive always been putting premium, but i lend the car to my dad for 3 days and he put $10 worth of unleaded. After that he told me that he filled it up with premium when I found out. It was only one time...
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10-16-2007, 03:27 PM	#9
///M3NACE Banned 168 Rep 3,900 Posts Drives: E36 M3, E36 Vert , E90 N52 Join Date: Oct 2006 Location: Downers Grove, IL iTrader: (5)	no put in diesel..its makes you go fastttt
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10-16-2007, 04:22 PM	#11
acblue94 Private First Class 9 Rep 109 Posts Drives: 325i Join Date: Aug 2007 Location: Miami iTrader: (0)	I mean 87 octane..I put only once..
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10-16-2007, 04:40 PM	#13
AndrewAZ Major 137 Rep 1,243 Posts Drives: 335i Join Date: Jan 2007 Location: CA iTrader: (0)	Lets just say if you ever have an engine issue and it goes to the dealer and they decide to test your gas and they find you are not using the recommended fuel bam your warranty is void. So if you really think its worth saving $2 every fill up then go for it, it might end up costing you in the long run if you have an issue.
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10-16-2007, 07:01 PM	#15
fotoguy335 Private First Class 4 Rep 102 Posts Drives: 2007 328xi Sparkling Graphite Join Date: Oct 2007 Location: Boston, MA iTrader: (0)	Lets see, we spend $38K+ on a car then a bunch more $$ on upgades and mods, and dont want to spend an extra $4.00 for a tank of gas...something doesnt add up __________________ 2007 335xi \| Premium pkg \|Cold Weather pkg\| Comfort Acc \| Logic 7 w/ iPod & USB\| 1968 MG-B Roadster
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10-16-2007, 07:04 PM	#16
阿龍\|ah_Long Enlisted Member 3 Rep 39 Posts Drives: e90 Join Date: Oct 2007 Location: cal iTrader: (0)	ok... use water
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10-16-2007, 07:07 PM	#17
uberschnell Brigadier General 675 Rep 4,080 Posts Drives: Wide Body 1 Join Date: Mar 2007 Location: Bay Area iTrader: (48)	Regular unleaded blended with 2-stroke oil, about 1 quart for every 10 gallons should work.
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10-16-2007, 08:54 PM	#22
Frank ZZR Private 5 Rep 63 Posts Drives: 2007 BMW 328i Sedan SG/Terra Join Date: Mar 2007 Location: Calgary, Alta iTrader: (0)	Do as I did. Test mpg for both regular and premium. Then choose a long straight hill and test for top speed at the top with both fuels. This will give you some indication as to what power gain or loss you have with each fuel. Then decide which fuel you should use. The results will save you money. BTW... regular is acceptable in a 325/328 and will NOT void your warranty.
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