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#4540722 - 10/11/17 09:49 PM Tan gunk growing/floating in new nissan coolant
Skanky Offline


Registered: 01/02/15
Posts: 205
Loc: Wa
I have a jug of Nissan L248SP coolant mixed with 50/50 distilled water about 3-4 yrs old. Been using it to add as needed. Today I opened it (been about 8 months since last used)and there is about 1/4" of tan gunk floating on top. I shook it and it does not mix in. I filtered it through coffee filter and it is slimy tan [censored]. Car tank and radiator look fine. Any ideas what it is. I have lots of coolant stored and none have [censored] growing in them. I have no intention of using it just wondering if it will grow more, its in new clean jug. I will post pics tomorrow.

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#4540749 - 10/11/17 10:22 PM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
rubberchicken Offline


Registered: 07/07/08
Posts: 399
Loc: Maryland USA
Sounds to me like a bit of oil got into container.

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#4540751 - 10/11/17 10:23 PM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
SirTanon Offline


Registered: 06/23/14
Posts: 2160
Loc: Phoenix, Arizona - USA
Odds are it will grow more. What you see collected at the top, which you filtered off is simply the part of it that grew and collected. I'd be willing to bet there's other... stuff.. in there that will continue to grow.

Almost sounds like a 'mother' of some sort.
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#4540762 - 10/11/17 10:49 PM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
Skanky Offline


Registered: 01/02/15
Posts: 205
Loc: Wa
Ya no way it has oil in it, original Nissan container. No oil smell and I have seen oil in coolant over the years not the same. Some other sort of growth, bacterial? Algea?
its Ethylene Glycol and contains no Amines, Silicates or Borates.


Edited by Skanky (10/11/17 11:01 PM)

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#4540965 - 10/12/17 08:10 AM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
Rand Offline


Registered: 08/20/03
Posts: 12651
Loc: NE,Ohio
its growing some kind of bacteria/slime/algae most likely.

Diesel fuel can as well.

I wouldnt use it.
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#4541548 - 10/12/17 08:14 PM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
Skanky Offline


Registered: 01/02/15
Posts: 205
Loc: Wa
nope not going to use it, just watching it and wondering if anyone else has ever seen it. I never have.


Edited by Skanky (10/12/17 08:28 PM)

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#4555189 - 10/26/17 01:46 PM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
andyd Offline


Registered: 09/25/04
Posts: 7158
Loc: Marshfield , MA
Take it back or use it? If the seal wasnt broken..
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#4559202 - 10/30/17 11:11 AM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
Skanky Offline


Registered: 01/02/15
Posts: 205
Loc: Wa
Nissan finally got back to me, Their engineers say it is the water pump seal lubricant they add. If it gets too old it can separate. They said don't use it. It was from E-bay so who knows how old it was before I opened it. The bottle I filtered did not grow anymore and now its been pitched. Car still looks good no residue in tank or in neck at radiator cap. However the car also has norosion in it 1 pint every year. The older version is what I have with the molybade.

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#4559755 - 10/30/17 11:14 PM Re: Tan gunk growing/floating in new nissan coolant [Re: Skanky]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Interesting and excellent explanation from Nissan.
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