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#4686055 - 03/06/18 09:23 AM Ok to mix DOT3 with DOT4?
DrRoughneck Offline


Registered: 02/05/16
Posts: 514
Loc: USA
My truck takes DOT3. I have a bottle of DOT4. Is it ok to top off the DOT3 with DOT4?

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#4686062 - 03/06/18 09:30 AM Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck]
MotoTribologist Offline


Registered: 02/03/16
Posts: 562
Loc: NJ, USA
Originally Posted By: DrRoughneck
My truck takes DOT3. I have a bottle of DOT4. Is it ok to top off the DOT3 with DOT4?

Yes, both DOT 3 and DOT 4 are miscible with one another and are typically compatible glycol based fluids.

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#4686102 - 03/06/18 10:23 AM Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck]
gathermewool Offline


Registered: 01/09/09
Posts: 5987
And 5.1 (not to be confused with 5.0)

3, 4, 5.1 - all compatible.

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#4686207 - 03/06/18 11:54 AM Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck]
dogememe Offline


Registered: 04/15/17
Posts: 597
Loc: SF BAY AREA, CA
yes, you can mix. If you have multiple vehicles and prefer to just stock one, just keep dot4 on hand, it works on both.
_________________________
2007 Ford Crown Vic P71 4.6 ~124K Miles, Valvoline SynPower 5W-30, Royal Purple Filter *Daily Driver*
2010 Ford Escape 2.5 ~70K Miles, Valvoline SynPower 5W-30, Wix Filter *Turo Rental Car*

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#4686215 - 03/06/18 12:00 PM Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck]
Kamele0N Offline


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
And dont forget to cure the cause for topping off!

You can have leak somewhere...or! Level between MAX-MIN usually coresponds with how much worn out your brakes are wink


Edited by Kamele0N (03/06/18 12:03 PM)
_________________________
2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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#4686676 - 03/06/18 07:09 PM Re: Ok to mix DOT3 with DOT4? [Re: gathermewool]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6142
Loc: USA
Originally Posted By: gathermewool
And 5.1 (not to be confused with 5.0)

3, 4, 5.1 - all compatible.


approved

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#4688778 - 03/08/18 02:15 PM Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3396
Loc: Columbus,Nebraska
Valvoline brake fluid is DOT3/DOT4 so what do you think?

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#4688821 - 03/08/18 03:02 PM Re: Ok to mix DOT3 with DOT4? [Re: Kamele0N]
nthach Offline


Registered: 01/02/04
Posts: 3887
Loc: California
Originally Posted By: Kamele0N
And dont forget to cure the cause for topping off!

You can have leak somewhere...or! Level between MAX-MIN usually coresponds with how much worn out your brakes are wink

Yep - I never top off brakes as the level sinks and rises according to how worn the friction is. There is never a need to top off a brake system. If you're constantly losing brake fluid you have a leak somewhere - but you can feel it in the pedal in most cases.

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