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  #51  
Old 09-05-2018, 12:14 PM
Michael Schott Michael Schott is offline
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Originally Posted by Vancityy View Post
My mom had a 2014 X1 and it was recommended (minimum) to use 89, but she used 87 for 1 year and for the next 3 years of the lease, the car was running so bad even putting premium 91 didn't help the problem. And no there were not any other engine issues.
Begs the question, how do you know there weren't other engine or transmission issues and why would 87 octane make the engine run badly?

Edit: Is this X1 a 35 (6 cylinder) or 28 (4 cylinder)? The 6 cylinder specifies 89 minimum and 91 recommended. The 4 cylinder 87 minimum, 91 recommended if I remember correctly.

Last edited by Michael Schott; 09-05-2018 at 12:57 PM.
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  #52  
Old 09-05-2018, 12:23 PM
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Originally Posted by namelessman View Post
LL14FE+ is LCI spec though, right?
Correct, LL-14 FE+ 0W-20 is BMW's recommendation for LCI F3x cars (2016-). Recommended engine oil for pre LCI F3x cars with N20/N26 engines is LL-01 5W-30 or LL-01FE 0W-30.
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Last edited by gkr778; 09-05-2018 at 12:24 PM.
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  #53  
Old 09-05-2018, 02:16 PM
namelessman namelessman is online now
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Originally Posted by Michael Schott View Post
Begs the question, how do you know there weren't other engine or transmission issues and why would 87 octane make the engine run badly?

Edit: Is this X1 a 35 (6 cylinder) or 28 (4 cylinder)? The 6 cylinder specifies 89 minimum and 91 recommended. The 4 cylinder 87 minimum, 91 recommended if I remember correctly.
My N26 fuel door says 89 min. 91 recommended.
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  #54  
Old 09-11-2018, 04:27 PM
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What's wrong with just following the instructions from the people that invented the motor it's going in to?
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  #55  
Old 09-11-2018, 05:16 PM
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What's wrong with just following the instructions from the people that invented the motor it's going in to?
Nothing, It's a great plan.
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  #56  
Old 09-11-2018, 08:59 PM
TDR0721 TDR0721 is offline
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I got a 2018 120i on January (same engine) and I run it on 91 which is the highest octane in my country, once accidentally filled it with 87 and felt a huge difference in power and responsiveness maybe it was so notorious because everything is in a mountain here (18-19 mpg)
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  #57  
Old 09-12-2018, 03:18 AM
jasondomina jasondomina is offline
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Originally Posted by tbraithw View Post
So I've got a very new 2018 320i.
What's the conventional wisdom on the appropriate grade of gas to use?
First inclination is to stick with Premium/93, but is it really making a difference on engine wear, crud build-up, or anything else?
Congratulations on your new BMW. Honestly I wonder the same thing every once in a while even though I sold them for years and still own one. It is a fair question. You are going to run into at least 2 schools of thought. Number one being the car will tolerate anything and will adjust timing, et cetera for variations in octane level of your chosen fuel. Number 2 you bought a really nice new car don't nickel and dime yourself into problems by not using top tear gas like shell V power.
So if your need is to be frugal and your fuel expense by the least expensive fuel you can get your hands on. But if your need is maximum performance by the highest octane level even get your hands on.
Just my 2 cents

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  #58  
Old 09-12-2018, 08:15 AM
rak299 rak299 is offline
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91 is the best gas I can get, unless I am willing to drive 50 miles and pay $8 per gallon for 101 octane so I buy the 91. I didn't pay $60k for a car so I could save $1.50 on a tank of gas and argue whether it might damage my engine.
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  #59  
Old 09-12-2018, 11:15 AM
BobinIl BobinIl is offline
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Originally Posted by rak299 View Post
91 is the best gas I can get, unless I am willing to drive 50 miles and pay $8 per gallon for 101 octane so I buy the 91. I didn't pay $60k for a car so I could save $1.50 on a tank of gas and argue whether it might damage my engine.
I envy you at only $1.50 more for a tank of premium. Yesterday I put a little over 15 gallons in our car and it was $14 higher for the tank vs. regular (.90 per gallon higher). I still use premium, but the difference is significant.
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  #60  
Old 09-12-2018, 12:30 PM
rounderman rounderman is offline
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I envy you at only $1.50 more for a tank of premium. Yesterday I put a little over 15 gallons in our car and it was $14 higher for the tank vs. regular (.90 per gallon higher). I still use premium, but the difference is significant.
wow that is a lot, only .40 per gallon (sometimes less) difference here. I only use premium
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  #61  
Old 09-12-2018, 01:23 PM
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87 to 93 is .45 cents right now with the stations running dry due to the storm.

That said on topic, I don't think anyone worrying about the spread between the 4 & 6 cylinder should be buying a BMW. If you need the gas savings to make the buy walk away & get a less expensive car.
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  #62  
Old 09-12-2018, 05:16 PM
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MY impression is no one is worrying about the price spread so that they can save enough to eat, but rather people are interested in avoiding what may be an unnecessary expense.
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  #63  
Old 09-12-2018, 05:50 PM
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Originally Posted by Elk View Post
MY impression is no one is worrying about the price spread so that they can save enough to eat, but rather people are interested in avoiding what may be an unnecessary expense.
15,000 miles a year @ 25MPG x .45 = $270 a year for 93 over 87

15,000 miles a year @ 25mpg x .30 = $180 a year for 89 over 87

25 is the EPA number for a 340 the 320 is 28 & the 330 is 27

We are not talking big bucks even if in was in your pocket all at one time & not spread out over 365 days or .73 a day premium for a 440 running 93 over 87.

Using the same numbers with 93 octane a 320 would save an extra $30 a year & a 330 $20 extra.

So IMHO fuel grade & 4 to 6 cylinder savings are not a decision point for most all $50/60K BMW purchases.

Being an open board I am sure a lot of guys feel differently. So my point is not that anyone will starve but that it's such a trivial amount you will never see it but that is life.
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  #64  
Old 09-12-2018, 08:41 PM
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But again there are those who would prefer not to spend money they do not have to - regardless of how trivial that amount may appear to others.
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  #65  
Old 09-12-2018, 09:42 PM
grandparipper grandparipper is offline
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Knock sensor

I believe the top tier cleaning of gasolines will keep your deposits away. Running some Techron through it occasionally makes me feel better.
My understanding is the way that the engine management system figures out the octane is when pressed hard, the knock of pre-detonation is literally heard by the sensors and the ignition and/or fuel supply is retarded to compensate. That reduces the performance when you ask for more power. The rest of the time, low octane is fine. The knock that the engine senses may be doing some damage every time it happens, so what are the long term effects? Buy a different car if you want to run regular grade, or do not be surprised when your valves, spark plugs, pistons, and other sensitive stuff gets degraded down the road.
Them's my thoughts!
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  #66  
Old 09-13-2018, 06:14 AM
Autoputzer Autoputzer is offline
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Originally Posted by Elk View Post
MY impression is no one is worrying about the price spread so that they can save enough to eat, but rather people are interested in avoiding what may be an unnecessary expense.
Big gains can be made by summing up a lot of little gains.

I saw a documentary about how American Airlines went after their fuel costs. They hit the big things first, obviously, but them kept going: carrying only the amount of fuel necessary for the flight plus a safety reserve, limiting the number of magazines and beverages they carried, leaving most of the exterior of the aircraft unpainted, training pilots to fly efficiently, etc., etc. etc,

One of my professors worked on some incredible aerospace projects back in the 1960's and 1970's. He told a story about working on missile project where the project manager would go over the prototypes periodically, snipping off the end of wire ties and putting them in a jar. Before it was over, he's shave pounds off of each vehicle. The professor didn't tell us this story so that we'd go around snipping wire tie ends for 35 years. He told us that story to impress upon us the importance of incremental improvement.

I had a GM pick-up truck that supposedly ran on 87 AKI. But, it pinged and I cold tell the difference in how it drove (especially up a hill) when I used better gas. So, I'd blend 1/2 87 AKI and 1/2 93 AKI to make 90 AKI. 90 AKI seemed to be the sweet spot. 90 AKI wasn't likely cost effective. But, my truck ran like it was supposed to.

BMW's require 91 AKI to run as advertised. But, 91 AKI is not sold where I live. I blend 1/3 87 AKI and 2/3's 93 AKI to make my own 91 AKI. Doing so will save me about $800 over the 100k miles I will keep my current BMW. But, I'm still getting the performance out of my BMW that I paid for. It takes me about one minute to reset the gas pump to dispense the second type of gasoline. But, that works out to me "earning" about $150/hour when I'm doing this.

Last edited by Autoputzer; 09-13-2018 at 06:17 AM.
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  #67  
Old 09-13-2018, 08:07 AM
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I always put the recommended grade of gasoline especially if it’s a force induction engine.

However some manufacturers recommend premium for the smug factor.
Back in 2010 the Lexus es350 premium was the recommend fuel. But the 2010 Toyota Camry v6 regular was the recommend fuel. Both cars use the exact same drivetrain. People were asking Lexus that question and the next year regular was the recommended fuel in the es350.


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  #68  
Old 09-13-2018, 12:10 PM
Mark K Mark K is offline
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Originally Posted by Alien007 View Post
What's wrong with just following the instructions from the people that invented the motor it's going in to?
Because it is a general knowledge that people who engineer and make motors/engines are the same exact people who also refine oil to produce gasoline and it is in their best interest to make you overpay for the stuff you do not need.

/sarcasm

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Last edited by Mark K; 09-13-2018 at 12:13 PM.
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  #69  
Old 09-13-2018, 01:55 PM
John MS John MS is offline
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Originally Posted by Alien007 View Post
What's wrong with just following the instructions from the people that invented the motor it's going in to?
That's exactly what I do and it works. Just pick 89 or 91 and get on with important issues. However if we all did that then there would be no fodder for endless pages of inane opinions about correct fuel octane, oil change frequency, oil type, tire pressure, etc.
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  #70  
Old 09-13-2018, 01:56 PM
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Originally Posted by eazy View Post
Back in 2010 the Lexus es350 premium was the recommend fuel. But the 2010 Toyota Camry v6 regular was the recommend fuel. Both cars use the exact same drivetrain. People were asking Lexus that question and the next year regular was the recommended fuel in the es350.
Both 2010 Camry V6 and 2010 ES 350 use Toyota's 2GR-FE engine, but they are calibrated differently. This engine is rated at 268 hp peak in the Camry and 271 hp peak in the ES. The higher peak power figure for Lexus ES is based on tuning that takes advantage of 91 AKI gasoline, though the ES runs fine on 87 AKI gasoline.

2011 ES 350 uses the same calibration as Camry and is rated at 268 hp, just like Camry.
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  #71  
Old 09-13-2018, 02:46 PM
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Think of all the fun you can have with that extra 3 HP!
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  #72  
Old 09-13-2018, 03:26 PM
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If you have forced induction...please tell me I don't have to explain it.
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  #73  
Old 09-14-2018, 11:57 AM
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gkr778 gkr778 is offline
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Originally Posted by Alien007 View Post
If you have forced induction...please tell me I don't have to explain it.
You're off the hook Alien007.

There's no relationship between forced induction and gasoline AKI requirements from the OEMs, so there's nothing to explain here.
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  #74  
Old 09-14-2018, 12:02 PM
Alien007 Alien007 is offline
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AKI?
We're talking about fuel bro.
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  #75  
Old 09-14-2018, 12:32 PM
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Originally Posted by Alien007 View Post
AKI?
We're talking about fuel bro.
AKI thought we were taking about gasoline octane.
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