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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-07-2014, 08:10 AM
jeanlucdckhard jeanlucdckhard is offline
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Noob Coolant Question

So two times out of the last.. about 16 times I have started my car it has come up with the low coolant warning. I checked both times, it looks to be ok, but I'd like to top it up just to avoid another warning that goes away.

Can you buy coolant off the shelf? The owners manual talks about splitting it with water, etc. Do I need to do that or do you all just dump the coolant in and go? Sorry for noob question, just trying to learn.
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  #2  
Old 05-07-2014, 08:14 AM
hondo402000 hondo402000 is offline
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I would purchase coolant from BMW, and its premixed, these blocks are Magnesium/aluminum, at least you Must use distilled water if you have to top it off in a pinch
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  #3  
Old 05-07-2014, 08:18 AM
fdriller9 fdriller9 is offline
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For topping off once in a while, straight coolant is fine.

But if you're continually topping off with just coolant, you will be reducing the effectiveness of the cooling system.

Coolant you buy is mainly just antifreeze. Water has better cooling capabilities than antifreeze.

The only reason you need antifreeze is so the coolant doesn't freeze and crack your engine or plumbing in the winter.

In the warm months, you can run just straight distilled water and be fine. You'll actually have better cooling efficiency.

Always use DISTILLED water. Tap water has minerals in it that can cake up in your cooling system and affect flow.

They sell pre-mixed coolant that is already mixed 50/50 but it's more expensive. You can buy a gallon of distilled water from your local supermarket for $1 or $2.
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  #4  
Old 05-07-2014, 08:22 AM
jeanlucdckhard jeanlucdckhard is offline
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Quote:
Originally Posted by fdriller9 View Post
For topping off once in a while, straight coolant is fine.

But if you're continually topping off with just coolant, you will be reducing the effectiveness of the cooling system.

Coolant you buy is mainly just antifreeze. Water has better cooling capabilities than antifreeze.

The only reason you need antifreeze is so the coolant doesn't freeze and crack your engine or plumbing in the winter.

In the warm months, you can run just straight distilled water and be fine. You'll actually have better cooling efficiency.

Always use DISTILLED water. Tap water has minerals in it that can cake up in your cooling system and affect flow.

They sell pre-mixed coolant that is already mixed 50/50 but it's more expensive. You can buy a gallon of distilled water from your local supermarket for $1 or $2.
Hey thanks much for all the info. I'll throw some coolant in there tomorrow as well as a little distilled water, it's getting warmer here finally.
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  #5  
Old 05-07-2014, 09:17 AM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by hondo402000 View Post
I would purchase coolant from BMW, and its premixed, these blocks are Magnesium/aluminum, at least you Must use distilled water if you have to top it off in a pinch
Coolant sold by BMW and Mini is NOT premixed.

You need to do a 50/50 distilled water/coolant mix.
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Old 05-07-2014, 09:53 AM
White94RX White94RX is offline
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+1

It is not premixed

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Old 05-07-2014, 10:55 AM
hondo402000 hondo402000 is offline
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well again another lie from the BMW place they said it was premixed, Which is what I prefer

plus anti freeze also have additives in it not just for freezing, it also increases the boiling temperature of the coolant too and it has anti corrosives in it
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  #8  
Old 05-08-2014, 12:37 PM
fdriller9 fdriller9 is offline
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Originally Posted by hondo402000 View Post
well again another lie from the BMW place they said it was premixed, Which is what I prefer

plus anti freeze also have additives in it not just for freezing, it also increases the boiling temperature of the coolant too and it has anti corrosives in it
Your dealer could be rebranding the oem coolant and pre-mixing it, then reselling it. I doubt it but I've seen that done before
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  #9  
Old 05-08-2014, 03:03 PM
Pilgrim Pilgrim is offline
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Quote:
Originally Posted by hondo402000 View Post
well again another lie from the BMW place they said it was premixed, Which is what I prefer

plus anti freeze also have additives in it not just for freezing, it also increases the boiling temperature of the coolant too and it has anti corrosives in it
READ the label on the container.

It will tell you whether it's premixed.

Antifreeze is most effective in a 50/50 solution with water.
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