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Old 03-14-2018, 07:49 AM   #1
ROTORCRAFT230
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Default Brake fluid DOT 3 or 4

Hello all, I know DOT 3 and 4 are comparable and is ok to mix bit I would like to know what Subaru puts in at the factory if anyone knows. The cap says DOT 3 and the car manual says donít mix. I have a 2014 WRX hatch.
Thanks
Mark
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Old 03-14-2018, 09:29 AM   #2
Samurai Jack
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Just go buy yourself some DOT3 / DOT4 brake fluid and you will be fine.
I use Valvoline Synthetic DOT3 / DOT4
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Old 03-14-2018, 05:22 PM   #3
Charlie-III
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I do not know what Subaru puts in.
I always tend to just use DOT 4, buy it by the multiple quart.
I will be switching to DOT 5.5 soon across the board.
Almost any DOT fluid can be used with any other OTHER THAN DOT 5!!!!!
DOT 5 is a different animal and should really not be used on the street.
Period.

Basically, the higher the number, the better it is in either temp rating or water rejection.
Don't use DOT 5 on the street.....yes, I'm repeating myself.
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Old 03-14-2018, 05:22 PM   #4
Charlie-III
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I do not know what Subaru puts in.
I always tend to just use DOT 4, buy it by the multiple quart.
I will be switching to DOT 5.5 soon across the board.
Almost any DOT fluid can be used with any other OTHER THAN DOT 5!!!!!
DOT 5 is a different animal and should really not be used on the street.
Period.

Basically, the higher the number, the better it is in either temp rating or water rejection.
Don't use DOT 5 on the street.....yes, I'm repeating myself.
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Old 03-16-2018, 11:06 AM   #5
ROTORCRAFT230
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Thanks all appreciated
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Old 03-16-2018, 02:43 PM   #6
mrsaturn7085
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If you want to use something other than OEM, do yourself a favor and look at the WET boiling point ratings rather than dry. These matter far more on a regular street driven car. Extreme dry ratings are better for track cars that get a brake bleed on a monthly basis.

Now that Super Blue is nearly impossible to get, Motul RBF600 has been a solid choice for me.
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Old 03-16-2018, 07:13 PM   #7
jamal
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Dot 4 is a newer standard with higher minimum wet and dry boiling points. So 4, or 5.1 are generally better to use than 3. However, there are other requirements regarding things like viscosity at certain temperatures, so while something like motul rbf600 has really high wet and dry boiling points, it doesn't meet all the requirements to be called dot 5.1. still, it's a good option and not too expensive.

Ate type 200 is the same as superblue, just not colored.

Until you're doing track days, changing the fluid often is way more important than the specific type used.
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Old 03-16-2018, 07:47 PM   #8
mrsaturn7085
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DOT 4 and DOT 5.1 are compatible but DOT 5 is not - I usually avoid 5 and 5.1 just to be safe but yeah, RBF600 is cheap enough that it's worked for me. The container quantity is a hell of a lot better than the large cans of TYP200/Super Blue I used to buy.

You are correct that ATE TYP200 is the same as Super Blue... but the only reason Super Blue is still worth using (if it were available) was you could alternate between the two and ensure a full flush. Modern fluids are much better than the 20-year old ATE formulations. It also takes about a half-dozen flushes to clear the blue dye out of the system completely if you've used SB in the past.

I agree that regular changes are more important which is why I'm not using SRF at $65 a bottle. For me, RBF600 strikes the happy medium of a modern quality fluid at a decent price... but seriously, the 500 ml bottles are a god-send when you can do a full clutch flush with one bottle on a Subaru.
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Old 03-23-2018, 11:20 AM   #9
car_freak85
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I'll toss in my vote for Motul RBF600, used it on multiple cars over the years, no issues.
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Old 04-10-2018, 11:18 AM   #10
cmiovino
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Quote:
Originally Posted by Samurai Jack View Post
Just go buy yourself some DOT3 / DOT4 brake fluid and you will be fine.
I use Valvoline Synthetic DOT3 / DOT4
I'll second Valvoline Synthetic DOT3 / DOT4. Cheap at Autozone and readily available. Change it every year for the good performance.
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