Synthetic dot 3 ?

[charles boyd]

I picked up a gallon of O'Reillys dot 3 @ $19.99. It was labeled synthetic. Is this new or have I just missed something? Is it comparable with any
dot 3?
--
C. Boyd
76 Crestmont
East Tennessee

 

[charles boyd]

Should read compatible. Can I mix it?

> I picked up a gallon of O'Reillys dot 3 @ $19.99. It was labeled synthetic. Is this new or have I just missed something? Is it comparable with
> any dot 3?

--
C. Boyd
76 Crestmont
East Tennessee

 

[john r. lebetski]

I thought DOT 3 was DOT 3 by definition and it is all made by a synthetic process. I buy the cheapest store brands and change it more often. Under
$4 a quart.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[Jim Hupy]

There is no such thing as "natural" dot 3 brake fluid. It is all synthetic.
Just a marketing talking point.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

> I thought DOT 3 was DOT 3 by definition and it is all made by a synthetic
> process. I buy the cheapest store brands and change it more often. Under
> $4 a quart.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
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[john r. lebetski]

Yep cheap insurance is to use a baster and replace what is in the MC at each oil change. Costs about $1.25.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[george rudawsky]

Good idea! Even though the brake fluid in the lines past the master cylinder is in an air-free environment, I could nerve understand why folks ran
'old' brake fluid through the system instead of removing it from the master cylinder reservoir and refilling with fresh fluid.
--
George Rudawsky
Chicago, IL
75 Palm Beach

 

[Ken H.]

I personally wouldn't depend on refilling the reservoir to significantly
affect anything beyond the master cylinder since it's a static
(non-recirculating) system. To really flush the system, one needs to watch
the fluid evacuated through each of the 6 bleeder valve and stop when the
new fluid being poured in the MC appears.

JMHO,

Ken H.

On Sat, Mar 11, 2017 at 2:09 PM, George Rudawsky
wrote:

> Good idea! Even though the brake fluid in the lines past the master
> cylinder is in an air-free environment, I could nerve understand why folks
> ran
> 'old' brake fluid through the system instead of removing it from the
> master cylinder reservoir and refilling with fresh fluid.
> --
> George Rudawsky
> Chicago, IL
> 75 Palm Beach
>
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> GMCnet mailing list
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>

 

[woody]

They're mutually compatible, but be aware that DOT3 has a 10% lower boiling point than DOT4.
--
1975 Avion 26' Transmode
TZE365V100846 Helena, Montana
EBL TBI, AL in man, in-tank pumps, AL rad, rear discs, Alcoas, Dakota Digital dash, all LED int and ext roof markers, Generac, Hubler torsion bars,
Quadrabags, Manny tranny, 3.70, Zip Dee.

 

[george rudawsky]

Back before the DOT interfered, Ate made available brake fluid in both blue and gold color. It made it easy to know when the old fluid was flushed
through the system. I often wonder if adding food coloring to brake fluid would do the same without affecting performance of the fluid.
--
George Rudawsky
Chicago, IL
75 Palm Beach

 

[john r. lebetski]

I agree that a "bleed till you see clear" is best, but my "change what is in the resevoirs at oil changes" proceedure is a practice that may actually
get done. Since DOT 3 is designed to attract moisture and the MC is not trully sealed-- and gets rained on by design in TZEs-I think the fluid up top
is the most sacrificial as far as doing the task of assimilating water, then becoming acidic. Also I always see spent rubber particulate mater in the
resevoirs which I can only think is a good idea to remove from the system. Having fresh non acidic fluid bathing the working rubber parts has to be
good, and if the stuff 15' back past the proportioning valve is stale the MC won't know if we don't tell it. George, I think food coloring has an
alcohol/ water content, and not sure if it would cause unforeseen reactions, but I bet 1 drop /qt container would be plenty to dye it and it could
easily assimilate that much moisture with plenty of reserve capacity. Chemistry wasn't my best subject, but it seems in real world, the chemical
degradation curves don't seem to be linear but have a rather hard edge at the end of their usable life as the working additives are used up.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[a.]

> ...food coloring has an alcohol/ water content, and not sure if it would cause unforeseen reactions, but I bet 1 drop /qt container would be
> plenty to dye it and it could easily assimilate that much moisture with plenty of reserve capacity. ...
Kool-Aid powder doesn't contain water or alcohol. But I don't know what it would do to the pH (or other properties) of brake fluid.
--
73 23' Sequoia 4 Sale
73 23' CanyonLands Parts Unit 4 Sale
Upper Alabama
"When I grow up I am going to be a curmudgeon."