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Old 03-13-2019, 05:06 PM
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Join Date: Aug 2016
Location: Brisbane, Australia
Posts: 46
talljames is on a distinguished road
Unhappy Tap water for coolent top up...aahhhh!

I have been topping my x5 e53 4.4i 2005 coolent up with tap water and have just discovered recently thisis a no no due to the deposites. The first time I did it the bmw guy on the phone said to just use tap water. I canít believe I didnít investigate this earlier! Now I hope I havenít stuffed something up with the deposites.

For the past 6 months I have been topping up with tap water. Lately, it has been 2L lots and now I have found the leak to fix. I know, extremely lazy on me not to address this earlier. So, I hope I havenít damaged anything.

Waiting on delivery of coolent expansion tank to fix leak then I will get it flushed and new coolent. But what to do till then? I was thinking of buying some coolent (VALVOLINE Zerex G-48 RTU 20L) already mixed and top it up with that or even get some bmw coolent and mix. I am definately going to get some demineralised water. I just hope I havenít stuffed the engine! Ahhhh....so frustrating that I didít investigate first like I usually do.

I only hope I have a little of the original coolent in there and it hasnít been expelled.
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  #2  
Old 03-13-2019, 07:00 PM
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Join Date: May 2017
Location: Colorado
Posts: 119
Attacking Mid is on a distinguished road
You'll be fine. Flush it out as best you can with distilled (demineralized) water. Then make sure you drain at least half the water out (I have to open the block drain on the 3.0L to get at least half out.) Then fill with pure BMW antifreeze until you've added half the listed capacity. Finish the fill/bleed process with your distilled water. You'll be good. The tap water isn't going to cause significant damage in the short run.

AM.
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E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
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  #3  
Old 03-13-2019, 07:26 PM
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Join Date: Aug 2016
Location: Brisbane, Australia
Posts: 46
talljames is on a distinguished road
Just found out a saving grace....because I have been topping up so often most of the gunk could be expelled and not have had a chance to settle.
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