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DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points #4583349
11/24/17 04:19 AM
11/24/17 04:19 AM
Joined: Aug 2004
Posts: 20,035
CA
The Critic Online crying OP
The Critic  Online Crying OP
Joined: Aug 2004
Posts: 20,035
CA
I recently had a 2016 MB E350 Sedan come in for its second "B" service at 41K. MB now requires a brake fluid replacement at every "B" service, which occurs every 2 years or 20K miles.

This vehicle specs "DOT4+" brake fluid, which some folks refer to as "Super DOT4." My understanding of "DOT4+" fluid is that it is supposed to carry a higher boiling point than regular DOT 4. I believe this is the only intended difference between "DOT4+" and regular DOT4 fluid.

Pentosin offers a Super DOT4 fluid that carries a dry boiling point of 265C (509F) and a wet boiling point of 165C (329F). My supplier sells Textar DOT4 LV fluid which carries a dry boiling point of 266C (511.8F) and a wet boiling point of 171C (339.8F). ATE also mentions in their marketing literature that ATE SL.6 can replace "Super DOT4" and their SL.6 fluid has a dry boiling point of 265C (509F) and a wet boiling point of 175C (347F).

So, my questions are as follows:

1) It appears that DOT4LV fluids have a superior dry/wet boiling point compared to a Super DOT4 fluid. What is the advantage of using Super DOT4/DOT4+ over DOT4LV?
2) Is there a published spec for minimum dry/wet boiling on DOT4+/Super DOT4 fluids?

Last edited by The Critic; 11/24/17 04:20 AM.

2011 Toyota Prius - 173k - Various 0W-20 (Brew)
2007 Honda Accord 2.4 - 131K - Mobil 1 EP HM 5W-30
Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583350
11/24/17 04:21 AM
11/24/17 04:21 AM
Joined: Aug 2004
Posts: 20,035
CA
The Critic Online crying OP
The Critic  Online Crying OP
Joined: Aug 2004
Posts: 20,035
CA
For the record, I flushed the MB using Textar DOT4 LV. I did not see the point of using Super DOT4, unless you folks advise me otherwise.


2011 Toyota Prius - 173k - Various 0W-20 (Brew)
2007 Honda Accord 2.4 - 131K - Mobil 1 EP HM 5W-30
Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583357
11/24/17 05:50 AM
11/24/17 05:50 AM
Joined: May 2005
Posts: 10,390
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,390
ROCHESTER, NY
I'm just guessing at any of this however:

1)It may only be proprietary? I can only assume that the higher boiling point of the Super DOT4 is for the possible higher speeds/harder braking situations and repeatedly.

2) IDK! However, MB's required/suggested brake fluid service of 2 yrs/20K miles may be due to the higher boiling point which may in fact absorb more moisture


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583365
11/24/17 06:26 AM
11/24/17 06:26 AM
Joined: Aug 2017
Posts: 220
Cincinnati, USA
Dave9 Offline
Dave9  Offline
Joined: Aug 2017
Posts: 220
Cincinnati, USA
DOT4+ is just a made up nonsense spec. DOT4 LV is fine. Trivial differences in temperature are trivial. The important thing is just that the industry slowly evolves the tech and a luxury brand will obviously recommend what's best at the time of the recommendation, even though in real world use it matters very little. What matters is you're covering your *** by at least using DOT4, not DOT3 and obviously not DOT5.

However if your goal is to preserve warranty, you need to use the official fluids not substitutes even if they are exactly the same thing in a bottle with different words stamped on it. If warranty be [censored], any DOT4 is fine. It's going to have other braking problems before a small boiling point difference matters if replaced on a 2 year interval, which in itself is excessive but I digress. Any brake system that doesn't have more margin than that is clearly defective.

Warranty preservation is the answer. Spend money to do that. Save money when it doesn't.

Last edited by Dave9; 11/24/17 06:27 AM.
Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583426
11/24/17 09:02 AM
11/24/17 09:02 AM
Joined: Mar 2008
Posts: 7,013
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,013
USA
Legally, there is no such thing as Super DOT 4. The "super" is just a marketing term. FMVSS 116 only defines DOT 3, 4, 5, and 5.1.

That said, Pentosin is good stuff even if a bit pricey. Autozone has a Bosch brake fluid that is also very good. The Textar you can get from your supplier will give you good results with no problems as well smile

Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583500
11/24/17 10:35 AM
11/24/17 10:35 AM
Joined: May 2014
Posts: 3,723
Columbus,Nebraska
Yah-Tah-Hey Offline
Yah-Tah-Hey  Offline
Joined: May 2014
Posts: 3,723
Columbus,Nebraska
DOT 4 is DOT 4 period.

Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583655
11/24/17 01:45 PM
11/24/17 01:45 PM
Joined: Oct 2017
Posts: 203
A Highway Near You
PiperOne Offline
PiperOne  Offline
Joined: Oct 2017
Posts: 203
A Highway Near You
Does the LV mean Low Viscosity? Does that matter for an ABS pump?


HDEO in Diesel Engines. No spark plugs here.
Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: PiperOne] #4583699
11/24/17 02:34 PM
11/24/17 02:34 PM
Joined: Mar 2008
Posts: 7,013
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,013
USA
Originally Posted By: PiperOne
Does the LV mean Low Viscosity? Does that matter for an ABS pump?


Yes. LV = Low Viscosity. its's supposed to make the ABS work a little better, particularly when it's cold smile

Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583742
11/24/17 03:28 PM
11/24/17 03:28 PM
Joined: Jun 2009
Posts: 1,371
Alaska
m37charlie Offline
m37charlie  Offline
Joined: Jun 2009
Posts: 1,371
Alaska
My 06 Unimog also "requires" DOT 4+ for the clutch linkage (because it is a MB product). Brakes are air fortunately. MB recommends clutch fluid change every 3 yrs, I stretch it to 5 since it didn't get dirty with tendency to malfunction till 8-9 yrs. My question is this:
since the clutch is NOT a heat buildup area compared to brakes, is there another grade of brake fluid that is compatible with DOT 4 (in other words NOT silicone based DOT 5)
that is LESS hygroscopic than DOT4+ and will therefore last longer in this relatively undemanding application?

Charlie


05 Unimog U500/Unicat camper/Delvac 1 SHC ACEA E4/E5
09 BMW X5 35d/Delvac1 LE 5W30
88 Toyota OJ50LV OM314 motor D1 SHC
52 Dodge M37/Hercules diesel

Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583755
11/24/17 03:56 PM
11/24/17 03:56 PM
Joined: Jan 2016
Posts: 321
Cheshire, England
barryh Offline
barryh  Offline
Joined: Jan 2016
Posts: 321
Cheshire, England
Since temperature and viscosity are not an issue with a clutch then DOT 3 is reckoned to be less hygroscopic than DOT 4. DOT 5.1 is the worst in this respect so definitely avoid that.


Barry

1979 BMW R45 (Triple QX 5W40)
2009 Mercedes C180K (Shell Helix Ultra 5W40)
Re: DOT 4+/Super DOT4 Minimum Dry & Wet Boiling Points [Re: The Critic] #4583796
11/24/17 05:20 PM
11/24/17 05:20 PM
Joined: Dec 2009
Posts: 25,600
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 25,600
Regina, Saskatchewan, Canada
Originally Posted By: The Critic
What is the advantage of using Super DOT4/DOT4+ over DOT4LV?

Probably a markup advantage for the company selling it. wink Personally, given the price I can get Castrol LMA DOT 4 at, there's no reason for me to try anything else of any different spec.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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