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#4713343 - 04/01/18 03:31 PM Does motor oil and DOT 3 brake fluid mix?
JAG Offline


Registered: 10/23/05
Posts: 4892
Loc: Fredericksburg, VA
Why would I ask such a thing? Science, only. No practical reason. I have the answer and want to see what your guesses are and why you think your answer is correct.

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#4713358 - 04/01/18 03:40 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
skyactiv Offline


Registered: 03/02/13
Posts: 4517
Loc: The Midwest
DOT 3 brake fluid and engine oil doesn't mix, but DOT 4 does since you didn't include it.
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#4713367 - 04/01/18 03:50 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Dot 3 is glycerin based, so is miscible with water and alcohol

It'll sink to the bottom of the oil pan.
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#4713373 - 04/01/18 04:01 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
JAG Offline


Registered: 10/23/05
Posts: 4892
Loc: Fredericksburg, VA
You guys are correct about DOT 3 not mixing with motor oil. With agitation, I got it to somewhat mix, but after sitting still for a while, the two fluids separated.

Linctex somewhat touched on the why no miscibility. Why do they not mix?

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#4713407 - 04/01/18 04:43 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
Hammehead Offline


Registered: 03/31/18
Posts: 99
GOOD STUFF HERE


Edited by Hammehead (04/01/18 05:08 PM)
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#4713491 - 04/01/18 06:52 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
Shannow Offline


Registered: 12/12/02
Posts: 40195
Loc: 'Stralia
Polarity and MW ?

On topic, we use a lot or re-refined oil for auxiliary fueling the boilers at work (250,000L for a cold start), 10-14Cst blend of used re-refined oil and diesel.

We had huge blockage issues a couple years ago. 5um filter as it goes onto the truck, and 25um filters blocked at the boiler.

Turned out to be glycol in the waste streams surviving the re-refiner, and then collecting (agglomerating soot particles, and forming quite strong stable particles).

They upper the upper temperature of the re-refiner, and problem went away.

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#4713499 - 04/01/18 07:04 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: Shannow]
Ducked Offline


Registered: 10/25/12
Posts: 4432
Loc: Taiwan
Originally Posted By: Shannow
Polarity and MW ?


Turned out to be glycol in the waste streams surviving the re-refiner, and then collecting (agglomerating soot particles, and forming quite strong stable particles).



Is that necessarily from brake fluid (glycol ether) or could it be from coolant (ethylene or propylene glycol)?

Probably more coolant being disposed of than brake fluid, and its known to cause that kind of thing in an operating engine with, say, a popped head gasket.

I keep my used brake fluid for cleaning things. You can't buy water-miscible brush cleaner any more.

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#4713501 - 04/01/18 07:05 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
andyd Offline


Registered: 09/25/04
Posts: 7293
Loc: Marshfield , MA
I have a few jars of used BF. I keep it around for air locks when I bleed. I don't like it on my skin and it tastes terrible. Is there any practical use for it? If not whats the best way to get rid of it?
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#4713506 - 04/01/18 07:11 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: Shannow]
JAG Offline


Registered: 10/23/05
Posts: 4892
Loc: Fredericksburg, VA
Originally Posted By: Shannow
Polarity and MW ?

On topic, we use a lot or re-refined oil for auxiliary fueling the boilers at work (250,000L for a cold start), 10-14Cst blend of used re-refined oil and diesel.

We had huge blockage issues a couple years ago. 5um filter as it goes onto the truck, and 25um filters blocked at the boiler.

Turned out to be glycol in the waste streams surviving the re-refiner, and then collecting (agglomerating soot particles, and forming quite strong stable particles).

They upper the upper temperature of the re-refiner, and problem went away.

Yes, the polarities of DOT 3 and motor oil are too dissimilar to allow miscibility. The brake fluid is more polar. Perhaps at high enough temperature they would be miscible but not at room temp. and 125F.

I ended up adding the brake fluid because for weeks I had been experimenting with seeing if motor oil would dissolve a sliver of varnish that was composed solely of oxidized vegetable oil. The answer was ďsort of, but mostly noĒ. I used Amsoil 10W-30, Maxima Formula K2 2-stroke oil (mostly esters), and Hy-per Lube polymer esters, separately. They did soften the varnish and give it flexibility that it lacked when dry. It also swelled. With gentle shaking, they did cause it to partially split apart. A very small piece or two did break off. Today I added brake fluid to the Amsoil that was already there. The varnish got even more flexible and swollen. Quite a few chunks broke off. The varnish became the consistency of mucous. DOT 3 is definitely more capable of dissolving vegetable oil varnish than the three other fluids I tested.

Thatís an interesting story about the blockage from ethylene glycol.

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#4713515 - 04/01/18 07:19 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: andyd]
JAG Offline


Registered: 10/23/05
Posts: 4892
Loc: Fredericksburg, VA
Originally Posted By: andyd
I have a few jars of used BF. I keep it around for air locks when I bleed. I don't like it on my skin and it tastes terrible. Is there any practical use for it? If not whats the best way to get rid of it?

You tasted it!? :-) I donít know if itís frowned upon but I plan on delivering used oil to a disposal place with a little bit of brake fluid in it. You could ask your collection place whether they accept brake fluid.

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#4713519 - 04/01/18 07:24 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
SilverSnake Offline


Registered: 05/29/13
Posts: 618
Loc: Florida
Originally Posted By: JAG
Why would I ask such a thing? Science, only. No practical reason. I have the answer and want to see what your guesses are and why you think your answer is correct.


You should never have brought this up. Someone on this forum will try putting it in their oil to "put the brakes" on oil deterioration to squeeze a few more miles out of an oil change.
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2008 20KW Generac (Amsoil 10W-30/30)

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#4713534 - 04/01/18 07:38 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
Shannow Offline


Registered: 12/12/02
Posts: 40195
Loc: 'Stralia
When I went to sell the plastic rocker covers from my L67, they were heavily varnished.

Solvents just didn't touch it...a caustic based shop degreaser just ate through it/

When we had to clean the turbine oil tanks, caustic based clearners and hot water were the only way to get the crud out.

Save the glycol for wood preserver...sure that it would work like Ethylene Glycol...

https://www.bobistheoilguy.com/forums/ub...ool#Post4695285

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#4713540 - 04/01/18 07:42 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: andyd]
Ducked Offline


Registered: 10/25/12
Posts: 4432
Loc: Taiwan
Originally Posted By: andyd
I have a few jars of used BF. I keep it around for air locks when I bleed. I don't like it on my skin and it tastes terrible. Is there any practical use for it? If not whats the best way to get rid of it?


See my post immediately above. (I'm afraid I used ritten wurdz. I'm too lazy to make youtube videos just to communicate effectively with Americans)

Specifically, it makes a good carburettor cleaner, and MIGHT therefore be effective on intake deposits on trendy DI engines.

I've heard of it being used as a decoker/ring unsticker, but I might want to use fresh stuff for that unless the used stuff was really clean.

Its water miscibility means it can be effectively combined with water washing, as in boil-washing carburettors.


Edited by Ducked (04/01/18 07:43 PM)

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#4713547 - 04/01/18 07:53 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
Silk Offline


Registered: 07/26/03
Posts: 4620
Loc: New Zealand
Engine oil doesn't work well in a brake system, I don't think the reverse is any good either.
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#4713591 - 04/01/18 08:41 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6386
Loc: USA
Don's some people add brake fluid to the engine if it's leaking bad? hide crush oilburner

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