| Synthetic dot 3 ? [message #314396] |
Sat, 11 March 2017 07:31  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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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
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| Re: Synthetic dot 3 ? [message #314397 is a reply to message #314396] |
Sat, 11 March 2017 07:33  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Should read compatible. Can I mix it?
C Boyd wrote on Sat, 11 March 2017 08:31I 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
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| Re: Synthetic dot 3 ? [message #314400 is a reply to message #314396] |
Sat, 11 March 2017 08:16 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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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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| Re: Synthetic dot 3 ? [message #314410 is a reply to message #314396] |
Sat, 11 March 2017 11:23 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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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
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| Re: Synthetic dot 3 ? [message #314418 is a reply to message #314396] |
Sat, 11 March 2017 13:09 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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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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| Re: [GMCnet] Synthetic dot 3 ? [message #314423 is a reply to message #314418] |
Sat, 11 March 2017 13:31 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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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
>
> _______________________________________________
> GMCnet mailing list
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Synthetic dot 3 ? [message #314429 is a reply to message #314396] |
Sat, 11 March 2017 16:20 |
pyolet
Messages: 78
Registered: August 2006
Location: Helena, MT
Karma: 0
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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.
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| Re: Synthetic dot 3 ? [message #314466 is a reply to message #314396] |
Sat, 11 March 2017 22:21 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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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
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| Re: Synthetic dot 3 ? [message #314492 is a reply to message #314396] |
Sun, 12 March 2017 10:58 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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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
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| Re: Synthetic dot 3 ? [message #314541 is a reply to message #314492] |
Sun, 12 March 2017 22:20 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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JohnL455 wrote on Sun, 12 March 2017 10:58...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.
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