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Ok to mix DOT3 with DOT4? #4686055
03/06/18 10:23 AM
03/06/18 10:23 AM
Joined: Feb 2016
Posts: 516
USA
DrRoughneck Offline OP
DrRoughneck  Offline OP

Joined: Feb 2016
Posts: 516
USA
My truck takes DOT3. I have a bottle of DOT4. Is it ok to top off the DOT3 with DOT4?

Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck] #4686062
03/06/18 10:30 AM
03/06/18 10:30 AM
Joined: Feb 2016
Posts: 686
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline

Joined: Feb 2016
Posts: 686
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.

Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck] #4686102
03/06/18 11:23 AM
03/06/18 11:23 AM
Joined: Jan 2009
Posts: 6,793
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,793
New England
And 5.1 (not to be confused with 5.0)

3, 4, 5.1 - all compatible.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck] #4686207
03/06/18 12:54 PM
03/06/18 12:54 PM
Joined: Apr 2017
Posts: 1,788
San Rafael, CA
dogememe Offline
dogememe  Offline

Joined: Apr 2017
Posts: 1,788
San Rafael, 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.


2010 Ford Escape 2.5 ~94K Miles: Royal Purple 5W-30 + Wix 51348
2008 Ford Crown Vic P71 4.6 ~167K Miles: AMSOIL SS 0W-30 + Wix 51372
1995 Chevy Silverado 5.7 ~277K Miles: Delo 10W-30 + ACDelco PF52
Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck] #4686215
03/06/18 01:00 PM
03/06/18 01:00 PM
Joined: Feb 2015
Posts: 2,593
Slovenia EU
Kamele0N Offline
Kamele0N  Offline

Joined: Feb 2015
Posts: 2,593
Slovenia EU
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

Last edited by Kamele0N; 03/06/18 01:03 PM.

2008 Toyota Yaris 1ND-TV 1.4 D4-D Elf FullTech FE 5w30
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: Ok to mix DOT3 with DOT4? [Re: gathermewool] #4686676
03/06/18 08:09 PM
03/06/18 08:09 PM
Joined: Mar 2008
Posts: 7,884
USA
slacktide_bitog Offline
slacktide_bitog  Offline

Joined: Mar 2008
Posts: 7,884
USA
Originally Posted By: gathermewool
And 5.1 (not to be confused with 5.0)

3, 4, 5.1 - all compatible.


approved

Re: Ok to mix DOT3 with DOT4? [Re: DrRoughneck] #4688778
03/08/18 03:15 PM
03/08/18 03:15 PM
Joined: May 2014
Posts: 3,942
Columbus,Nebraska
Yah-Tah-Hey Online content
Yah-Tah-Hey  Online Content

Joined: May 2014
Posts: 3,942
Columbus,Nebraska
Valvoline brake fluid is DOT3/DOT4 so what do you think?

Re: Ok to mix DOT3 with DOT4? [Re: Kamele0N] #4688821
03/08/18 04:02 PM
03/08/18 04:02 PM
Joined: Jan 2004
Posts: 4,987
California
nthach Online content
nthach  Online Content

Joined: Jan 2004
Posts: 4,987
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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