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  #21  
Old 10-03-2021, 09:58 AM
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Good to know my X5 is on average with others with similar miles. Once it passes inspection, O2 sensors and plugs are due in. I don't want to disturb anything before emissions testing. Once it passes, a whole year can be used to troubleshoot it. I don't think it can tell between 89 and 91 octane. I have not put in any 87 and probably won't either. For an extra 75 miles more than my truck for the same amount of fuel, it's worth it. I don't let it go under 1/2 tank either. I didn't have time to fill it last week. It went 325+ miles on 3/4 of a tank so I'm happy.
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  #22  
Old 10-03-2021, 10:19 AM
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Quote:
Originally Posted by X5chemist View Post
Good to know my X5 is on average with others with similar miles. Once it passes inspection, O2 sensors and plugs are due in. I don't want to disturb anything before emissions testing. Once it passes, a whole year can be used to troubleshoot it. I don't think it can tell between 89 and 91 octane. I have not put in any 87 and probably won't either. For an extra 75 miles more than my truck for the same amount of fuel, it's worth it. I don't let it go under 1/2 tank either. I didn't have time to fill it last week. It went 325+ miles on 3/4 of a tank so I'm happy.
It knows the difference between 89 and 91 octane. It has knock sensors and adjusts the timing for the lower grade fuel. This also results in a loss of HP. There is also a small risk of burning a valve running 89. BMW requires 91 octane. There are others here that are running 89, to save money, with no problems, but I run the 91 as that is what BMW designed it to run on. I have run it on a few occasions with 89 because I couldn't get 91 and had to fill up. There was no difference that I noticed.
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  #23  
Old 10-03-2021, 11:01 AM
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I ran out of fuel and when my rescue brought 87, the car misfired and failsafe on the first push of the gas pedal. I had my scanner hooked up and reset it so I could accelerate, but I got one more b failsafe on the 7 mile trip to the gas station.

Wife's e70 has 89 requirement and I never noticed so we've been using 93. I plan to test 89 soon. My new scanner will show the last five fill ups if the fuel met octane requirement.
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  #24  
Old 10-03-2021, 11:09 AM
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Even when I had to fill with 89, it still had half a tank of 93. So it has not run full 89. I'm sure the previous owners probably ran 87 in it all the time. The more I run it, the more it cleans up. It was crazy to see it go past a 500 mile range on it's only round trip out of town. It started with a full tank of 91 then. Once I finish the other two vehicle distractions, the X5 is due for lots of new parts.
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Last edited by X5chemist; 10-03-2021 at 11:39 AM.
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  #25  
Old 10-03-2021, 11:10 AM
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Quote:
Originally Posted by andrewwynn View Post
I ran out of fuel and when my rescue brought 87, the car misfired and failsafe on the first push of the gas pedal. I had my scanner hooked up and reset it so I could accelerate, but I got one more b failsafe on the 7 mile trip to the gas station.

Wife's e70 has 89 requirement and I never noticed so we've been using 93. I plan to test 89 soon. My new scanner will show the last five fill ups if the fuel met octane requirement.

What scanner is that? Thanks.
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  #26  
Old 10-03-2021, 11:32 AM
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use the highest octane available

Quote:
Originally Posted by andrewwynn
I ran out of fuel and when my rescue brought 87, the car misfired and failsafe on the first push of the gas pedal. I had my scanner hooked up and reset it so I could accelerate, but I got one more b failsafe on the 7 mile trip to the gas station.

Wife's e70 has 89 requirement and I never noticed so we've been using 93. I plan to test 89 soon. My new scanner will show the last five fill ups if the fuel met octane requirement.
Quote:
Originally Posted by X5chemist
Even when I had to fill with 89, it still had half a tank of 91. So it has not run full 89. I'm sure the previous owners probably ran 87 in it all the time. The more I run it, the more it cleans up. It was crazy to see it go past a 500 mile range on it's only round trip out of town. It started with a full tank of 91 then. Once I finish the other two vehicle distractions, the X5 is due for lots of new parts.
Before I got my '01 X5 3.0i recently, I had been running all my current vehicles on 87 octane gas (with up to 10% ethanol), usually sourced at local QuikTrip's. Their engines range from 2.2l-155 hp four cyl to 300hp 6.0l v-8, and built from '98-'09, so they're designed for 87 octane.

Previously, I had driven some vehicles on the street that needed more octane, with engines with 10.5:1 compression to 14:1. The 10.5:1 and 11:1 engines needed 89 octane, and some added supplements during warmer weather, and knock seldom occurred with pump gas. When I tried the 13:1 or 14:1 engines, even premium 93 octane just wouldn't do, so I used VP race gas or later a home-brewed aviation fuel/Marvel Mystery oil mix (on the 14:1 dedicated to dragracing after only one drive on the street). That got to be rather expensive!

Now, with the X5, I plan to treat it to QuikTrip premium 93 octane (10% ethanol) exclusively, after the previous owner/restorer had tried using 89 octane for awhile (reported no adverse effects). However, I'm more of a leadfoot than he was, so I defer to the safer grade of fuel. I'm still on my first tank of mixed 89/93 octane right now.

If ever out in the boonies, I'll carry some octane booster (probably with MTBE) along, just-in-case I must refill with lesser fuels. A long time ago (1990) and far away (in Seguin, Tx.) I filled-up my S-10 with bad gas from a mom & pop roadside store about 2am (running out of gas). I barely made it back to Dallas, due to excessive knocking, later stalling; I drained the tank, treated it to premium gas + octane boost for two tanks, and vowed to never resort to just any source for fuel again.
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  #27  
Old 10-03-2021, 11:52 AM
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Originally Posted by X5chemist View Post
I don't let it go under 1/2 tank either. I didn't have time to fill it last week. It went 325+ miles on 3/4 of a tank so I'm happy.
There is no good reason to avoid going below half tank and you risk getting stranded if you don't occasionally make sure the tank can go below 1/4 to make sure the siphon jet is functional.

Explain your rationale behind 1/2 tank.

I wrote "the book" on e53 fuel delivery, so I know the fact based answers.

The way the X5 fuel tank works, once there is less than 27L of fuel, it relies on the siphon pump to draw fuel from the left side of the tank.

The right side has a sump where the pump is, that holds approximately 5L of fuel so effectively the truck only sees 5L fuel tank no more once 3/8 of a tank or so.

This is not a "problem to be avoided". It's a normal operation that needs to be occasionally tested.

When the siphon jet fails (and it almost certainly will) it's an easy repair with an o-ring and zip tie. (the failure can be prevented with a zip tie if done preemptively).

All BMW should go through the test of the siphon jet at least 1-2x per year until the repair is done.

I learned the hard way since my wife never went below 3/8 tank so I got stranded on a freeway 50 mi. from home on 6 F=-14 c day where all the tow trucks were busy helping people with dead batteries.

The only benefit of keeping half tank minimum is having more immediate range without stopping for gas.

I drive until my low fuel light comes on virtually always. On 3.0 engine that's with 8=11.6L of fuel, with 4.4, 10=13.6L of fuel.

11.6L, just over 3gal means over 40 miles range on a bad day, and I'm never farther than that from a gas station.

So, once you confirm you can drive down to single digits distance to empty, feel free to waste half your range filling up twice as often if you feel you need to for some reason, but do the test occasionally or you will certainly get stranded "that one time" you need more range.

Also, as I started, explain the reason for half tank, so if there is a good reason I can update my "book on fuel supply".
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  #28  
Old 10-03-2021, 12:41 PM
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12 gallons @$3.69 = $44.28
24 gallons @3.69 = $88.56
I like keeping some BEvERage change in my pocket between pay days. Waaaahhhaaaaaa.
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  #29  
Old 10-03-2021, 12:41 PM
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What scanner is that? Thanks.

Think Diag.

Before you go buy one, don't. Terrible support and very buggy software. It decided recently to only crash and I can't use on my e53 right now. I'll try on wife's e70 to read the gas octane quality.

I would love to run 89 on her car if there is no benefit to the 93 and save $6-8 per fill.
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  #30  
Old 10-03-2021, 12:49 PM
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Originally Posted by X5chemist View Post
12 gallons @$3.69 = $44.28
24 gallons @3.69 = $88.56
I like keeping some BEvERage change in my pocket between pay days. Waaaahhhaaaaaa.

That's a solid reason. I fill up to HALF for the same reason.

I do trips to Chicago and I just put in 8-12g to cover the trip and have some in town left over I get no satisfaction from the pump clicking off on its own.

I estimate how many miles=gallons I need each week and put in what I need. When prices drop a lot I'll fill it up to save per mile.

I've considered using the top half of the tank vs. the bottom half but you can't program DTE to tell you how many miles left to half a tank :-).

So: once in a while test your fuel gauge. Use the hidden menu test six to make sure you can get down to near zero on the left tank.

Once below about 27L the right side should stop moving at about 1.4L and the left side should drop to zero.

If, while the left drops to say 20L and the right slowly drops to 1.0 or 0.9L get some gas immediately and go home and fix your siphon jet o-ring.

A design flaw will cause every single one to fail eventually.
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