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Amsoil dot 3 & 4 = AutoZone brake fluid? #4542712
10/13/17 10:38 PM
10/13/17 10:38 PM
Joined: Jan 2017
Posts: 278
Iowa
Iowegian Offline OP
Iowegian  Offline OP
Joined: Jan 2017
Posts: 278
Iowa
https://www.amsoil.com/shop/by-product/o...fullDescription

http://m.autozone.com/brake-and-power-st...1_0_0?location=

Same bottle
Same viscosity
Same wet boiling point
1 degree difference in dry boiling point.
....same stuff but much cheaper?

Correct me if I'm wrong?

Last edited by Iowegian; 10/13/17 10:39 PM.

2011 Equinox, 2.4l
2009 Sienna, 3.5l
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542719
10/13/17 10:45 PM
10/13/17 10:45 PM
Joined: Aug 2008
Posts: 3,159
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,159
USA
We'll never know! crzy

That being said, brake fluid is pretty much brake fluid.. not much room for creativity given what it's supposed to do.

Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542751
10/13/17 11:47 PM
10/13/17 11:47 PM
Joined: Aug 2016
Posts: 654
New Jersey
THafeez Offline
THafeez  Offline
Joined: Aug 2016
Posts: 654
New Jersey
I have a feeling that more expensive brake fluids such as severe duty and maybe full synthetic have a higher boiling point compared to the regular dot 3/4 fluids that just barely pass DOT standards and go for cheap.

Links you posted might as well be the same stuff if bottled by one company. Sometimes they'll put the same stuff that one retailer calls for (amsoil) if the specs are the same or lower for another brand (autozone). It's cheaper that way since they can order in bulk. This is all speculation though.. Just my 2 cents.


2004 Toyota Solara SE 2.4 2AZFE
182,000 miles
Castrol Magnatec Semi-Syn 5W30
Royal Purple 20-400 oversize 2nd run
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: THafeez] #4542764
10/14/17 12:10 AM
10/14/17 12:10 AM
Joined: Jun 2002
Posts: 19,235
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,235
Iowegia - USA
Originally Posted By: THafeez
I have a feeling that more expensive brake fluids such as severe duty and maybe full synthetic have a higher boiling point compared to the regular dot 3/4 fluids that just barely pass DOT standards and go for cheap.



All brake fluids have 100% synthetic components today.

https://bobistheoilguy.com/forums/ubbthr...ids#Post3076040


Reading is fundamental; understanding is not a given ability.
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542768
10/14/17 12:14 AM
10/14/17 12:14 AM
Joined: Aug 2008
Posts: 18,538
Ontario, Canada
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 18,538
Ontario, Canada
I use the cheapest stuff I can find that meets the rating required. I change it every couple of years when I replace the pads because most of the fluid is in the lines and out of the master cylinder at that point.

I start out by taking out as much as possible of the remaining fluid in the master cylinder, then top off with fresh fluid (over full) and then slightly crack open the bleeders and let the stuff drip out while I do other work on the vehicle. Keep topping off and then close up the bleeders and check the system for air.

It's really easy and it has served me well for decades.


'18 Highlander - AMSOIL SS 0w20 / ATF / Severe Gear
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF (R.I.P)
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542786
10/14/17 12:47 AM
10/14/17 12:47 AM
Joined: Jan 2017
Posts: 278
Iowa
Iowegian Offline OP
Iowegian  Offline OP
Joined: Jan 2017
Posts: 278
Iowa
But wet boiling point is 368 for both of these. That far exceeds required dot 4 requirements.


2011 Equinox, 2.4l
2009 Sienna, 3.5l
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: MolaKule] #4542801
10/14/17 01:20 AM
10/14/17 01:20 AM
Joined: Aug 2016
Posts: 654
New Jersey
THafeez Offline
THafeez  Offline
Joined: Aug 2016
Posts: 654
New Jersey
I don't doubt you MolaKule. Lucas DOT 3 says 100% Full Synthetic on the shelf next to all the other brake fluids. Made me think the rest weren't synthetic and Lucas was superior. Thanks for the clarification. Not a fan of Lucas or their advertising.


2004 Toyota Solara SE 2.4 2AZFE
182,000 miles
Castrol Magnatec Semi-Syn 5W30
Royal Purple 20-400 oversize 2nd run
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542814
10/14/17 02:36 AM
10/14/17 02:36 AM
Joined: Apr 2012
Posts: 5,153
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,153
MA
Those are pretty good specs for a fluid that's supposed to be Dot 3. It basically exceeds Dot 4 specs. Makes me wonder if it's legit or not. Have to check the actual bottle. If you look at the MSDS sheet, it only mentions 446F for Dot 4, but that sheet was revised 20 years ago.

Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: THafeez] #4542824
10/14/17 03:08 AM
10/14/17 03:08 AM
Joined: Aug 2006
Posts: 9,804
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,804
Central Washington
Originally Posted By: THafeez
I don't doubt you MolaKule. Lucas DOT 3 says 100% Full Synthetic on the shelf next to all the other brake fluids. Made me think the rest weren't synthetic and Lucas was superior. Thanks for the clarification. Not a fan of Lucas or their advertising.

Don't quote me but I don't think Lucas started the "Synthetic" brake fluid labeling. I would say who I think started it but will refrain because Im too lazy right now to research it.


-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542830
10/14/17 04:10 AM
10/14/17 04:10 AM
Joined: Dec 2011
Posts: 4,743
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,743
North Carolina
Brake fluid is more or less brake fluid for daily driving.

The Bosch can is the performance secret on the parts store shelves.


"Zed's dead baby, Zed's dead."
Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542855
10/14/17 05:52 AM
10/14/17 05:52 AM
Joined: Jul 2005
Posts: 30,430
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,430
NY
Sometimes you're paying more for a name. In this case I'd go with the cheaper product, and save the extra cash for something else from Amsoil where you're actually getting value for the added cost.


God Bless Our Troops

Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542869
10/14/17 06:40 AM
10/14/17 06:40 AM
Joined: Dec 2016
Posts: 94
Indiana, USA
Smoqueed Offline
Smoqueed  Offline
Joined: Dec 2016
Posts: 94
Indiana, USA
The bottles don't look entirely the same, and I doubt the Autozone "DOT3" actually has those specs. I would need to go there and double check the bottle itself, sometimes they mix up stuff on the website. Regardless, unless you're tracking the car, using super high boiling point brake fluids is kinda pointless. Most standard DOT3 will work just fine for 99% of people. For a little added protection during spirited driving, I use Valvoline DOT3/4. It's like $6 or $7 for a 32 oz bottle at Meijer. Claims 480F dry and 311F wet boiling points for only a little more than a 32oz bottle of standard DOT3.

Looking back at the autozone website, their 32oz of Autozone fluid has the same specs as the 12oz bottle. Maybe it's not a fluke. If not, that's a terrific price for that level of boiling protection. Also took a look at that Bosch brake fluid. Looks like some super stout stuff. Plus I really like metal cans for brake fluid. However, I wont spend $15 a quart for brake fluid when I've never had problems with the $7 a quart stuff

Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542892
10/14/17 07:23 AM
10/14/17 07:23 AM
Joined: Sep 2013
Posts: 10,451
Indiana
dlundblad Online happy
dlundblad  Online Happy
Joined: Sep 2013
Posts: 10,451
Indiana
I just buy ST brake fluid and call it a day.

No need to buy anything else.


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542921
10/14/17 08:06 AM
10/14/17 08:06 AM
Joined: Feb 2017
Posts: 67
NY
2dogs Offline
2dogs  Offline
Joined: Feb 2017
Posts: 67
NY
Walmart ST brand for me too. For decades.

Re: Amsoil dot 3 & 4 = AutoZone brake fluid? [Re: Iowegian] #4542936
10/14/17 08:20 AM
10/14/17 08:20 AM
Joined: Jan 2017
Posts: 278
Iowa
Iowegian Offline OP
Iowegian  Offline OP
Joined: Jan 2017
Posts: 278
Iowa
I will probably just get dot 3 stuff too.
From what I have read, dot 4 absorbs moisture more quickly than dot 3 and must be changed out sooner.
I am looking for the best quality/reliability/durability.
I don't want to have to change brake fluid in 3 years.

Anyway, I brought this up because of the curiosity/news component.
Just ran into this wbile researching.
If others like the Amsoil dot 3 & 4, you might want to look into this.

If someone can educate me? But I would assume that this stuff will probably absorb moisture more quickly?
I am looking to not have to change fluid again for a while but to also have good corrosion resistance.

Thanks!

Last edited by Iowegian; 10/14/17 08:22 AM.

2011 Equinox, 2.4l
2009 Sienna, 3.5l
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