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  #1  
Old 02-17-2019, 12:47 PM
740ldXdrive 740ldXdrive is offline
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Low coolant warning in a 2016 750i

So I got a low coolant warning yesterday about 5 minutes from home, the engine temperature gauge was normal the whole time, I got Peak Coolant from the gas station, I haven't used it yet since the idrive car manual said something to the effect of unapproved additives can damage the engine etc.

Unfortunately the BMW dealership is closed over the weekend and I can't get BMW OE coolant. Is there any safe/approved alternatives to BMW coolant when one is in a pinch to top off low coolant? I've read online that glysantin G48 is the BMW OE coolant, some threads say Zerex G05 be can be used, others say it's unsafe. The owner's manual is unhelpful, it just tells u to visit the dealership or approved repair center for the types of additives.

I'm tempted to just top off with distilled water to bypass the whole inappropriate coolant will destroy ur engine thing..

Any recommendations?

Also, is it unusual to have to top off coolant? This is the first low coolant warning I've had, I haven't seen any fluid leakage in my parking spot at work or home, It's been cold (low 20s) not sure if the coolant volume contract a bit in very cold weather or if there's a leak somewhere ... Tempted to just take it in this week to exclude leakage in the cooling system..

thanks guys!
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Old 02-17-2019, 12:51 PM
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Distilled water is your best bet, you can always add the concentrated BMW coolant of the same volume later once you get it to even it out.


As for Leakage, it wouldn't be a bad idea to ask the dealer if they will look at it. There is a small amount of normal loss due to evaporation and off gassing, take note of how much water is needed to bring it to full to aid in diagnosis.


Also, make sure you check both coolant reservoirs, and check them with a cold engine.
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Old 02-17-2019, 01:03 PM
luigi524td luigi524td is offline
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Some G30 drivers have also reported some low coolant alerts requiring the addition of a small amount of coolant. I had my first at about 6,000 - 8,000 miles / almost one year. My dealer inspected - found no leaks - and added some coolant. The next was about a year later - about 16,000mi. It was at the time of servicing. Dealer checked for issues - added a few ounces of BMW coolant. I see no indications of leaking or weeping around hoses, tanks, or engine components. As a precaution I asked my service advisor for come pre-mixed BMW coolant so if (when) it happens again I wouldn't have to drive 25 miles to have it topped off. He obliged and gave me almost a full gallon (50-50mix) of the BMW stuff. I'd estimate that in more than 16,000 miles and almost 2 years the addition of coolant was less than 8 ozs.

According to service techs there seems to be something related to turbo cooling that results in coolant consumption. I'm puzzled since it is a "sealed system". And none of my other current BMWs or recent BMWs also with and without turbos only had coolant losses when there was a leak - very very common with cracked BMW plastic overflow and cooling system components.

Several brand name coolants are compatible with BMW spec coolant. A small amount of distilled water would be OK - but ONLY A SMALL AMOUNT (8 oz or less). But for futures and to be in the safe side I recommend you also ask your BMW service center to provide you (?courtesy?) with some BMW coolant so you don't have to resort to using an off-brand or straight distilled water.
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Last edited by luigi524td; 02-17-2019 at 01:06 PM.
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Old 02-17-2019, 08:26 PM
740ldXdrive 740ldXdrive is offline
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Originally Posted by God-Follower View Post
Distilled water is your best bet, you can always add the concentrated BMW coolant of the same volume later once you get it to even it out.


As for Leakage, it wouldn't be a bad idea to ask the dealer if they will look at it. There is a small amount of normal loss due to evaporation and off gassing, take note of how much water is needed to bring it to full to aid in diagnosis.


Also, make sure you check both coolant reservoirs, and check them with a cold engine.
Thanks for the prompt response, I went with a little bit of distilled water, it required about 1/4 of a gallon. I'll take it in for the peace of mind.

Thanks again!
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Old 02-17-2019, 08:31 PM
740ldXdrive 740ldXdrive is offline
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Originally Posted by luigi524td View Post
Some G30 drivers have also reported some low coolant alerts requiring the addition of a small amount of coolant. I had my first at about 6,000 - 8,000 miles / almost one year. My dealer inspected - found no leaks - and added some coolant. The next was about a year later - about 16,000mi. It was at the time of servicing. Dealer checked for issues - added a few ounces of BMW coolant. I see no indications of leaking or weeping around hoses, tanks, or engine components. As a precaution I asked my service advisor for come pre-mixed BMW coolant so if (when) it happens again I wouldn't have to drive 25 miles to have it topped off. He obliged and gave me almost a full gallon (50-50mix) of the BMW stuff. I'd estimate that in more than 16,000 miles and almost 2 years the addition of coolant was less than 8 ozs.

According to service techs there seems to be something related to turbo cooling that results in coolant consumption. I'm puzzled since it is a "sealed system". And none of my other current BMWs or recent BMWs also with and without turbos only had coolant losses when there was a leak - very very common with cracked BMW plastic overflow and cooling system components.

Several brand name coolants are compatible with BMW spec coolant. A small amount of distilled water would be OK - but ONLY A SMALL AMOUNT (8 oz or less). But for futures and to be in the safe side I recommend you also ask your BMW service center to provide you (?courtesy?) with some BMW coolant so you don't have to resort to using an off-brand or straight distilled water.

Thanks for the info, glad to hear I'm not alone with this issue. Also reassuring that they didn't find leaks in yours. I leaning towards consumption too, I don't see any fluid puddles in my parking spot... I think I'll take it in to exclude leakages. I'm fine with topping off the coolant occasionally assuming there's nothing leaking.

Thanks again for the very informative post!
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Old 02-17-2019, 09:19 PM
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Which reservoir was low? I assume the larger of the two(high temp circuit) based on your 1/4 gallon fill quantity.

Quote:
Originally Posted by 740ldXdrive View Post
Quote:
Originally Posted by God-Follower View Post
Distilled water is your best bet, you can always add the concentrated BMW coolant of the same volume later once you get it to even it out.


As for Leakage, it wouldn't be a bad idea to ask the dealer if they will look at it. There is a small amount of normal loss due to evaporation and off gassing, take note of how much water is needed to bring it to full to aid in diagnosis.


Also, make sure you check both coolant reservoirs, and check them with a cold engine.
Thanks for the prompt response, I went with a little bit of distilled water, it required about 1/4 of a gallon. I'll take it in for the peace of mind.

Thanks again!
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Old 02-18-2019, 12:10 PM
luigi524td luigi524td is offline
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Exclamation Topping off larger reservoir

Quote:
Originally Posted by God-Follower View Post
Which reservoir was low? I assume the larger of the two(high temp circuit) based on your 1/4 gallon fill quantity.
1/4 of a gallon "might" be a mis-statement[=a QUART]; On the 2 times (over past 2 years) I've had to bring that tank from "MIN" to "MAX" it took about 4oz-6oz of premixed BMW coolant. That tank is NOT meant to be full to the tippy top.
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Last edited by luigi524td; 02-19-2019 at 08:15 AM.
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Old 02-18-2019, 12:13 PM
luigi524td luigi524td is offline
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Question coolant top-off

Quote:
Originally Posted by 740ldXdrive View Post
Thanks for the info, glad to hear I'm not alone with this issue. Also reassuring that they didn't find leaks in yours. I leaning towards consumption too, I don't see any fluid puddles in my parking spot... I think I'll take it in to exclude leakages. I'm fine with topping off the coolant occasionally assuming there's nothing leaking.

Thanks again for the very informative post!
Glad you found the info helpful. As I have often noted, this is the FIRST time I've had a BMW that needed coolant topped off where the loss is said to NOT be the result of a faulty cooling system.
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Old 02-19-2019, 09:21 AM
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Auto Zone has the blue Peak OE Coolant specifically for European vehicles. The specs says it can be used on all BMW models. $19.99. Link
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Old 02-28-2019, 05:37 PM
740ldXdrive 740ldXdrive is offline
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Originally Posted by God-Follower View Post
Which reservoir was low? I assume the larger of the two(high temp circuit) based on your 1/4 gallon fill quantity.

I only found one reservoir in my vehicle, my owner's manual references two reservoirs but only 1 was visibly obvious to me. See attached pics
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Old 02-28-2019, 05:44 PM
740ldXdrive 740ldXdrive is offline
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Originally Posted by luigi524td View Post
1/4 of a gallon "might" be a mis-statement[=a QUART]; On the 2 times (over past 2 years) I've had to bring that tank from "MIN" to "MAX" it took about 4oz-6oz of premixed BMW coolant. That tank is NOT meant to be full to the tippy top.
At least 1/4 of a gallon, I didn't measure it but based on how much was left in the gallon it's estimate at least 1/4 if not a 1/3.

So I definitely have an external leak, I continued needing to top if off every 3 or so days (BMW OEM coolant) and couple days ago I saw a puddle of coolant in my parking spot. Took it in, and the lower radiator hose and turbo coolant hoses are all leaking, and BMW CPO conveniently doesn't cover "rubber" coolant hoses

Looking at $3K in repairs @52Kmi

Oh well, first major expense in 5 months of ownership
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Last edited by 740ldXdrive; 02-28-2019 at 05:46 PM.
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Old 02-28-2019, 06:00 PM
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Quote:
Originally Posted by 740ldXdrive View Post
Quote:
Originally Posted by God-Follower View Post
Which reservoir was low? I assume the larger of the two(high temp circuit) based on your 1/4 gallon fill quantity.

I only found one reservoir in my vehicle, my owner's manual references two reservoirs but only 1 was visibly obvious to me. See attached pics
Both reservoirs are visible in the first pic, the low temp reservoir is right in front of the rounded on the engine cover.
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Old 03-03-2019, 01:41 PM
740ldXdrive 740ldXdrive is offline
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Originally Posted by God-Follower View Post
Both reservoirs are visible in the first pic, the low temp reservoir is right in front of the rounded on the engine cover.
Thanks for some reason I thought they were next to each other, so I gave up looking for the low temp circuit one

Now I know.

Also, do u know if there's a way to manually check oil level (dipstick anywhere) or is the iDrive vehicle status menu the only option? How about brake and power steering fluid levels? I'm still learning about this car.

THanks in advance!
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Old 07-04-2019, 04:46 AM
DavidR DavidR is offline
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Experienced a coolant leak in my 2016 750i xdrive at 37,000 miles. Still under factory warranty. Dealer did a system pressure check. Found coolant leaking lines for turbocharger leaking. Fix: Replaced all turbocharger coolant lines with both brackets. Refill and bleed system. Just a heads up that you may want to get a system pressure check.
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