Recent Topics
S/C Range Rover, 5000kms 33 different oils UOA
by Vladiator
04/22/18 04:24 PM
Buying oil on price - Pricing Rant
by JHZR2
04/22/18 04:22 PM
Mix of 33 oils VOA
by Vladiator
04/22/18 04:19 PM
Sugar Binge Hangover ... :~/
by LoneRanger
04/22/18 04:18 PM
MagnaFlow 49253 Exhaust Header
by Ambition5253
04/22/18 04:14 PM
Difference between NGK BR6ES and BPR6ES ?!?
by webfors
04/22/18 04:08 PM
Griot's Garage Glass Polish leaving dried flakes
by mclasser
04/22/18 03:56 PM
Pennzoil Platinum 10W30
by turnbowm
04/22/18 03:55 PM
Adhesive for clay pot repair?
by callbay
04/22/18 03:40 PM
G35 rough start
by bowlofturtle
04/22/18 03:37 PM
Parts Master 67045 5K OCI Cut Open
by Ifixjetz1
04/22/18 03:03 PM
Best Subcompact Cars in the US & Global
by NewEnglander
04/22/18 02:41 PM
Super Tech Clearance purchase
by mctmatt
04/22/18 01:58 PM
Website Loading Issue
by sleddriver
04/22/18 01:51 PM
White List?
by BlueOvalFitter
04/22/18 01:43 PM
Troubleshooting F-250 Tranny
by dkryan
04/22/18 01:19 PM
Cabin Vibration
by artbuc
04/22/18 12:27 PM
High Mileage ATF D&F
by FriboRage
04/22/18 12:07 PM
The new Fram TG 3682
by aquariuscsm
04/22/18 12:06 PM
Under cam cover-'74 BMW 2002
by wings&wheels
04/22/18 11:47 AM
Newest Members
Tremendo, homeontherange, dreko, Marc32275Jax, puma4440
64809 Registered Users
Who's Online
76 registered (andyd, 2015_PSD, 93cruiser, Ambition5253, Astro_Guy, 7 invisible), 1622 Guests and 44 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
64809 Members
68 Forums
282143 Topics
4710458 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#4713343 - 04/01/18 03:31 PM Does motor oil and DOT 3 brake fluid mix?
JAG Offline


Registered: 10/23/05
Posts: 4662
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.

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


Registered: 03/02/13
Posts: 4170
Loc: The Midwest
DOT 3 brake fluid and engine oil doesn't mix, but DOT 4 does since you didn't include it.
_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

Top
#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: 5694
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.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

Top
#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: 4662
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?

Top
#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: 51
Loc: Right there
GOOD STUFF HERE


Edited by Hammehead (04/01/18 05:08 PM)
_________________________
ToYota Corolla XEI 2010 1zzfe
Kawasaki Ninja ZX9R B4
Taurus GL Vulcan
Citroen C5 phase I
I used to use syn, now whatever is on sale and never had problems. This noob knows stuff.

Top
#4713491 - 04/01/18 06:52 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
Shannow Online   content


Registered: 12/12/02
Posts: 38972
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.

Top
#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: 4059
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.

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


Registered: 09/25/04
Posts: 6873
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?
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline bulk 0w20 and ? filter

Top
#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: 4662
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.

Top
#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: 4662
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.

Top
#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: 571
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.
_________________________
2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 3.6L-295 HP (PUP 0W-20)
2008 20KW Generac (Amsoil 10W-30/30)

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


Registered: 12/12/02
Posts: 38972
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

Top
#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: 4059
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)

Top
#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: 4377
Loc: New Zealand
Engine oil doesn't work well in a brake system, I don't think the reverse is any good either.
_________________________
1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - MSL 5/30
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.

Top
#4713591 - 04/01/18 08:41 PM Re: Does motor oil and DOT 3 brake fluid mix? [Re: JAG]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 5832
Loc: USA
Don's some people add brake fluid to the engine if it's leaking bad? hide crush oilburner

Top
Page 1 of 2 1 2 >