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View Poll Results: Does your b58 consume coolant?
Yes 53 54.64%
No 44 45.36%
Voters: 97. You may not vote on this poll

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      11-03-2017, 02:17 PM   #89
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Quote:
Originally Posted by bayern68 View Post
The bigger reservoir is for cooling the engine, the small one is for the intercooler (charge air cooler).

As far as I know, the circuits are totally separated from each other.
So they need to be checked and topped off seperately.

The water level must be checked when motor is cold, level should be between min & max.
Although there is only a small gap between min and max.

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      11-09-2017, 06:42 AM   #90
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Hi
Someone else got the low coolant issue?
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      11-10-2017, 01:03 AM   #91
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There have been a few issues with B58 water pumps leaking mostly 2016 year cars.
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      11-15-2017, 07:21 AM   #92
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My 440ix B58 is at BMW dealer now, as they insisted coolant loss is not a normal thing on any car. As no leak could be found and pressure OK, BMW is gonna check and replace the turbocharger. According to them several cases of unexplained coolant loss reported in Germany and Belgium, all solved by replacing turbocharger.
My car has 16000 miles.
All costs incl loaner on BMW account (warranty).
I keep you informed, as it looks like several B58 owners have the low coolant issue.
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      11-15-2017, 08:17 AM   #93
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It really is weird. I could imagine the turbo leaking or contributing to burning coolant, but if that's the case then the pressure test should have failed.
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      11-22-2017, 01:33 AM   #94
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Turboloader changed yesterday on warranty after low coolant message at 12k miles. According to the mechanics, turbo was leaking coolant water, but only internally, that's why no water leakage under the car. Water evacuated through exhaust pipe. Although the leak was very small.
Dealer also said it's a known issue on B58 2016 production.
I check in 2000 miles if level still at max...
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      11-26-2017, 09:51 PM   #95
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Quote:
Originally Posted by kern417 View Post
I think i'm going to check mine now (at 1500mi) and monitor it over the next couple months to see if it's getting lower and by how much. I just took delivery 2 months ago and haven't peeked at the coolant levels yet.
Well, naturally I procrastinated and regret it. These are my coolant levels now, currently 1800 miles. There are no low level warnings or lights on the dash. After all my arguing, it sure does make a good case for being underfilled from the factory. Not sure why there aren't any warning lights though. I wish I had checked sooner. If I had thought about it I would have checked at delivery.

Large Tank below min (looks dry to be honest):


Small tank between min and max:
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Originally Posted by umizoomi View Post
As long as 3-pedals are an option, I will exercise my right to suffer the handicap and indignity of slower shifts and reaction times.

Last edited by kern417; 11-27-2017 at 12:36 AM.
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      11-26-2017, 11:05 PM   #96
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Wouldn’t you smell coolant through your exhaust if it was being burned up through the turbo
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      11-26-2017, 11:22 PM   #97
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Not if the leak was slight. Keep in mind that the ethylene glycol would be diluted by the water of the exhaust, as well as being boiled off by the heat.
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      11-27-2017, 12:57 AM   #98
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Quote:
Originally Posted by kern417 View Post
Well, naturally I procrastinated and regret it. These are my coolant levels now, currently 1800 miles. There are no low level warnings or lights on the dash. After all my arguing, it sure does make a good case for being underfilled from the factory. Not sure why there aren't any warning lights though. I wish I had checked sooner. If I had thought about it I would have checked at delivery.

Large Tank below min (looks dry to be honest):
Add me to the list! Mine looks exactly the same as yours. It's got to be a factory fill issue. I have 2300 miles on my 2017 340ix. This was the first time I looked into my reservoirs and I was shocked to see the my larger (radiator) tank was practically empty and the smaller (intercooler) is barely at the Min mark. I'm not going to the dealer for this but will top it off myself. But will keep an eye on it.
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      11-27-2017, 01:01 AM   #99
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Quote:
Originally Posted by bayern68 View Post
Turboloader changed yesterday on warranty after low coolant message at 12k miles. According to the mechanics, turbo was leaking coolant water, but only internally, that's why no water leakage under the car. Water evacuated through exhaust pipe. Although the leak was very small.
Dealer also said it's a known issue on B58 2016 production.
I check in 2000 miles if level still at max...
I have a 2017 340ix and mine is bone dry in the larger reservoir and barely at minimum in the smaller intercooler tank. This is checking it when it is stone cold in the morning.

So it remains to be seen. My car is a April 2017 manufacture date. Either they all are leaking at the turbos or are getting underfilled at the factory. I only have 2300 miles on my car and it's the first time I looked.
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      11-27-2017, 08:44 AM   #100
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Quote:
Originally Posted by kern417 View Post
Well, naturally I procrastinated and regret it. These are my coolant levels now, currently 1800 miles. There are no low level warnings or lights on the dash. After all my arguing, it sure does make a good case for being underfilled from the factory. Not sure why there aren't any warning lights though. I wish I had checked sooner. If I had thought about it I would have checked at delivery.
I really don't understand why there would be so many dealers not bothering to check coolant level during delivery. Don't we pay them to prep the car?

I'm leaning to it being an early B58 issue as @bayern68 said.
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      11-27-2017, 09:19 AM   #101
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Quote:
Originally Posted by anotheran View Post
I really don't understand why there would be so many dealers not bothering to check coolant level during delivery. Don't we pay them to prep the car?

I'm leaning to it being an early B58 issue as @bayern68 said.
i wouldn't consider it early issue at this point. my car was a July '18 build. that's over a year in production.
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As long as 3-pedals are an option, I will exercise my right to suffer the handicap and indignity of slower shifts and reaction times.
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      11-27-2017, 09:20 AM   #102
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Quote:
Originally Posted by dsc888 View Post
Add me to the list! Mine looks exactly the same as yours. It's got to be a factory fill issue. I have 2300 miles on my 2017 340ix. This was the first time I looked into my reservoirs and I was shocked to see the my larger (radiator) tank was practically empty and the smaller (intercooler) is barely at the Min mark. I'm not going to the dealer for this but will top it off myself. But will keep an eye on it.
i'm going to the dealer so someone at corporate gets another ping about the issue and hopefully works on resolving it. it has to hit their warranty metrics before any engineers will put their attention to the issue. plus i have other things i can have them look at.
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As long as 3-pedals are an option, I will exercise my right to suffer the handicap and indignity of slower shifts and reaction times.
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      11-27-2017, 06:21 PM   #103
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Mine is a 440i GC March 2017 build and had the light come on at 15,000 miles.

I was near the dealer, and I'd just had a free health check when I put my winters on that didn't mention it, so I just took it straight in to them to check.

They took it in and brought it back out pretty quickly saying that the levels were fine and the light must have been an error. It had gone off when I arrived with them, just came on the first time I started the car in the morning.

4 days later it came on again. I checked myself this time, main reservoir looked empty and smaller one low. I topped it up myself. Couldn't be bothered to say anything to dealer, although now I've read this thread I might.
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      11-28-2017, 11:11 AM   #104
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Im at 27k miles, light came on maybe 10k miles ago, I checked the coolant level and it was at max. So I brought it in, they said its not a problem and that it shouldnt come back. Well its back... So I will be taking it in once again.
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      11-28-2017, 04:14 PM   #105
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Quote:
Originally Posted by Alex440 View Post
Mine is a 440i GC March 2017 build and had the light come on at 15,000 miles.

I was near the dealer, and I'd just had a free health check when I put my winters on that didn't mention it, so I just took it straight in to them to check.

They took it in and brought it back out pretty quickly saying that the levels were fine and the light must have been an error. It had gone off when I arrived with them, just came on the first time I started the car in the morning.

4 days later it came on again. I checked myself this time, main reservoir looked empty and smaller one low. I topped it up myself. Couldn't be bothered to say anything to dealer, although now I've read this thread I might.
It's pretty annoying when they can't be bothered to follow through. Mine told me that I can bring it in to get topped off, but an inspection would be at cost since i don't have any warning lights yet. So even though the tank is empty, they won't perform an inspection for leaks under warranty because there's no CEL.
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As long as 3-pedals are an option, I will exercise my right to suffer the handicap and indignity of slower shifts and reaction times.
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      12-04-2017, 03:17 PM   #106
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I should have known I would leave my first dealership experience annoyed, but TL/DR: They overfilled both reservoirs and sent me on my way.

Scenario
I tried to get to the dealer early so I could leave the car outside to cool off for a bit before they brought it in, but my newborn pretty much made the decision for me that I was going to get there after they opened. In hindsight, I should have waited in the car 15-20min so I would know it's cooled off, so my mistake there. Anyway, I parked outside with the hood up and walked inside to explain the situation, and they insisted that I just bring it in and they'll top it off right then. Apparently everyone else that actually had appointments at opening time hadn't showed yet, and they knew they were going to get really busy when a bunch of people showed up at once. So i let them bring it in, watched them wince and jump at trying to open the reservoir while the engine was still hot and steam was coming out, but finally they got it open after it cooled down slightly and pressure was relieved. I then saw the tech pouring coolant in both reservoirs. I explained that only the large tank was low, but he insisted that it was actually the small tank that was low because "i can still see coolant circulating in the large tank." Probably not the best time to measure coolant levels, eh? So I stopped him but of course it was too late.

The funny thing was the SA also insisted that my coolant loss may come from blowing past the "pressure relief valve" (pointing to the bleed screw on the reservoir), but "it's normal because twin power engines run hot." They did however insist that if it dropped again, they would do an inspection for leaks under warranty. Just not sure how i feel about their competency after this ordeal.

Current coolant levels as follows:

Large Reservoir


Small Reservoir
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      12-04-2017, 03:52 PM   #107
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Had this on my X3 (2012); turned out to be a junk recovery/expansion tank. The cap wouldn't even be tight- a 2yr old could turn it at any time. Pressure/vapor would blow right past the cap and keep triggering the low coolant light. Just had it fixed under CPO coverage.....(thank you Pacific BMW!).
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      12-07-2017, 10:07 PM   #108
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I just got this today on my 2016 340ix, lucky me.

SA built 11/15. It now has 11,784 miles.

I looked at the reservoirs, the main one is below Low, the smaller one - the turbo’s? - is also just below the Low tab, but still contacting it.

Will call SA tomorrow.
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      12-07-2017, 11:19 PM   #109
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Do the caps on the reservoirs require a particular torque when screwing them on? I've seen people comment about loose or faulty caps... I've not checked my coolants levels (August 2017 SA build) but would like to.
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      12-08-2017, 08:57 AM   #110
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Do the caps on the reservoirs require a particular torque when screwing them on? I've seen people comment about loose or faulty caps... I've not checked my coolants levels (August 2017 SA build) but would like to.
No. It's like your gas cap. There is a detent and it clicks into place. There are also alignment arrows on the cap and large reservoir for reference.

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