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#4674320 - 02/22/18 11:43 AM run straight coolant
slomo Offline


Registered: 08/23/13
Posts: 164
Loc: Oklahoma
Who has done this?

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#4674324 - 02/22/18 11:46 AM Re: run straight coolant [Re: slomo]
kschachn Offline


Registered: 12/26/05
Posts: 9504
Loc: Upper Midwest
Why would you want to so this? In general, heat transfer is compromised compared to a water mixture, as is freezing point. Most automakers specify a maximum concentration and there's a reason they do so.

For reference here are a few threads on waterless coolants, including one you started a year or two ago:

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4338324/Waterless_Anti-freeze#Post4338324

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4038277/Evans_waterless_coolant#Post4038277

https://bobistheoilguy.com/forums/ubbthreads.php/topics/3699927/Waterless_coolant#Post3699927

https://www.bobistheoilguy.com/forums/ub...ant#Post4491106
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#4674326 - 02/22/18 11:46 AM Re: run straight coolant [Re: slomo]
MotoTribologist Offline


Registered: 02/03/16
Posts: 576
Loc: NJ, USA
What do you mean by coolant? Are you referring to water?

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#4674329 - 02/22/18 11:48 AM Re: run straight coolant [Re: slomo]
rollinpete Offline


Registered: 03/20/17
Posts: 498
Loc: West Ma.
50/50 for me
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97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive183k miles
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I like my oil (slippery).


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#4674343 - 02/22/18 12:00 PM Re: run straight coolant [Re: slomo]
Dave Sherman Offline


Registered: 01/03/06
Posts: 1082
Loc: Ohio
No, because it would be expensive and pure coolant does not transfer heat as well.
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#4674351 - 02/22/18 12:05 PM Re: run straight coolant [Re: slomo]
windeye Offline


Registered: 02/26/09
Posts: 200
Loc: NY, USA
No one should be doing this. Aside from the reasons mentioned already, straight (near 100%) coolant actually has a much higher freezing point than 50/50 mixed with water. Use de-ionized water or distilled water, or buy premixed from dealer.
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#4674367 - 02/22/18 12:21 PM Re: run straight coolant [Re: slomo]
Gimpy1 Offline


Registered: 08/24/17
Posts: 115
Loc: Displaced Texan in Mexico City
Never run straight coolant it doesn't transfer heat very well. Ideally straight DI water is the best coolant due to its ability to absorb heat, however using pure water leads to lubrication and oxidation issues. Most race tracks especially for motorcycles ban the use of coolant and will check you radiator to pass tech they only thing allowed is water wetter (purple ice or redline water wetter for example)
Question is why would you want to do that, just run what the OEM recommends, don't try to out think the automotive engineers, they test vehicles in severe conditions for a reason, plus running 12 or 14 quarts of pure coolant is way more expensive than diluting it.

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#4674369 - 02/22/18 12:22 PM Re: run straight coolant [Re: windeye]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1577
Loc: wv
If you dont do a complete block flush and drain and only do the petcock or lower hose removal.. you can run straight coolant then drain at a later date and install the 50/50 mix. There is a bit of coolant that doesnt get removed in a lower radiator drain so you wont technically be running 100 percent coolant if you just fill the rad with straight unmixed coolant.

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#4674377 - 02/22/18 12:25 PM Re: run straight coolant [Re: slomo]
JMJNet Offline


Registered: 09/06/07
Posts: 950
Loc: TX, USA
Is there a particular reason to ask the question?
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#4674378 - 02/22/18 12:26 PM Re: run straight coolant [Re: slomo]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: Connecticut
I ran 80-90% water + RL WW during hot summers on one of my old muscle cars that ran "hot." Would never think of running beyond 60-70% straight coolant. What's the advantage?
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2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
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#4674380 - 02/22/18 12:29 PM Re: run straight coolant [Re: Gimpy1]
fredly Offline


Registered: 01/26/18
Posts: 9
Loc: DC
Why you think glycol coolants not allowed on race track? Reason has nothing to do with which better, reason is strict ly to do with glycol spills are very slippery. Period, end of discussion. Water wetter garbage fine for track events where you changing it out constantly. Go peddle your water wetter elsewhere.

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#4674411 - 02/22/18 12:54 PM Re: run straight coolant [Re: fredly]
Gimpy1 Offline


Registered: 08/24/17
Posts: 115
Loc: Displaced Texan in Mexico City
Who's peddling water wetter, I simply stated what is allowed. Never said put water wetter in your radiator did I?

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#4674416 - 02/22/18 12:58 PM Re: run straight coolant [Re: slomo]
MotoTribologist Offline


Registered: 02/03/16
Posts: 576
Loc: NJ, USA
Apparently you didn't read about how the discussion (that we were all obviously having about why water wetter is so great whistle) was ended.

No need to respond further LOL

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#4674459 - 02/22/18 01:27 PM Re: run straight coolant [Re: slomo]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2441
Loc: Balearic Islands , Spain
I run premixed 20-30% coolant 80/70% water green gycol coolant in everything i own.
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1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Comma X-Flow XS 10W-40.

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#4674465 - 02/22/18 01:32 PM Re: run straight coolant [Re: FordCapriDriver]
Rand Offline


Registered: 08/20/03
Posts: 12721
Loc: NE,Ohio
Originally Posted By: FordCapriDriver
I run premixed 20-30% coolant 80/70% water green gycol coolant in everything i own.


if you use less than 30% coolant or more than 70% coolant it can cause issues

30/70 is a good compromise for hot climate.

70/30 is for best freezing protection

50/50 for most climates is great.

disclaimer I am talking about normal stuff, green,pink,red,orange,blue etc.

not including exotic "waterless coolant" etc.
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