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ATF D/F, hot, warm, or cold ? #4693931
03/13/18 07:39 PM
03/13/18 07:39 PM
Joined: Apr 2017
Posts: 1,029
Ohio
hallstevenson Offline OP
hallstevenson  Offline OP
Joined: Apr 2017
Posts: 1,029
Ohio
I've seen reasons from people saying to drain ATF when it's hot, others say do it when it's "warmed up", and others say to do it when it's cold (let the car sit overnight and drain in the morning, for example). Varying reasons are when hot, it flows better. Or when it's cold, any 'sediment' should have settled to the bottom of the pan and come out (vs getting 'caught' in different parts of the transmission before it's dropped down ?).

Finally, at least with a D/F, ATF expands when warm/hot so the amount you measure isn't accurate when you replace it with the same amount of COLD ATF (you'll put in (slightly) too much). I realize one option is to let it drain and cool down and then use that measurement amount. If so, to what temperature - ambient (same temperature as the new ATF that's sitting waiting to be used), 100 F, 125 F ?

Re: ATF D/F, hot, warm, or cold ? [Re: hallstevenson] #4693940
03/13/18 07:49 PM
03/13/18 07:49 PM
Joined: Mar 2013
Posts: 5,030
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,030
The Midwest
Do both.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: ATF D/F, hot, warm, or cold ? [Re: hallstevenson] #4694000
03/13/18 08:23 PM
03/13/18 08:23 PM
Joined: Sep 2013
Posts: 10,679
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,679
Indiana
You are supposed to check/ add ATF to a hot transmission.

Say 4 hot quarts drain out and 4 cold quarts are dumped back in... I personally don't think that'd even be enough to matter. Heck, there may even be more user error in the measuring and adding.

Last edited by dlundblad; 03/13/18 08:24 PM.

03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: ATF D/F, hot, warm, or cold ? [Re: hallstevenson] #4694007
03/13/18 08:30 PM
03/13/18 08:30 PM
Joined: Jan 2017
Posts: 1,977
VW Fanboy Island
maxdustington Offline
maxdustington  Offline
Joined: Jan 2017
Posts: 1,977
VW Fanboy Island
I just left the bottle out overnight after getting the car into a position where I could service it.

One thing I have considered is if your fluid is contaminated, would the contaminants make a difference in the volume of fluid versus clean fluid? When I changed my ATF it was black as coal, and the on the second D&F it was black with a reddish tinge. Surely that fluid had less ATF per unit of volume than virgin ATF?


03 Jetta AWP/09A 205k kms
Edge 0W40 + Mann 719/30
Re: ATF D/F, hot, warm, or cold ? [Re: hallstevenson] #4694073
03/13/18 09:32 PM
03/13/18 09:32 PM
Joined: Oct 2010
Posts: 5,410
Florida
Artem Offline
Artem  Offline
Joined: Oct 2010
Posts: 5,410
Florida
Originally Posted By: hallstevenson
I've seen reasons from people saying to drain ATF when it's hot, others say do it when it's "warmed up", and others say to do it when it's cold (let the car sit overnight and drain in the morning, for example). Varying reasons are when hot, it flows better. Or when it's cold, any 'sediment' should have settled to the bottom of the pan and come out (vs getting 'caught' in different parts of the transmission before it's dropped down ?).


Actually if you wait for the fluid to cool off and allow the sediment to settle, it's actually WORSE because that's when the stuff gets stuck behind. Every flush manufacturer show the same thing. Here's some pics.

I recommend you change it Warm, so you don't burn yourself while working on the car. This way all the contaminants are suspended and COME OUT with the OLD OIL. This should be common sense.






2014 Mazda 3 Hatch 2.0L & 6spd - Idemitsu 0w20 Synthetic @ $0.75 a quart. (thanks Advance Auto Parts for the awesome deal)
Re: ATF D/F, hot, warm, or cold ? [Re: Artem] #4694237
03/14/18 05:32 AM
03/14/18 05:32 AM
Joined: Aug 2010
Posts: 5,933
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,933
Champlain/Hudson Valley
A fellow claimed he'd pull the plug for a D&F then chase out whatever drained with one fresh quart of fluid.
His idea was to rinse out the bits depicted above.

Seemed wasteful to me.

I like the idea of positioning the car the night before (in my case, on ramps)....but I don't do it.

Re: ATF D/F, hot, warm, or cold ? [Re: Kira] #4694469
03/14/18 10:08 AM
03/14/18 10:08 AM
Joined: Dec 2002
Posts: 4,252
The Garden State
Whimsey Offline
Whimsey  Offline
Joined: Dec 2002
Posts: 4,252
The Garden State
Originally Posted By: Kira
A fellow claimed he'd pull the plug for a D&F then chase out whatever drained with one fresh quart of fluid.
His idea was to rinse out the bits depicted above.

Seemed wasteful to me.

I like the idea of positioning the car the night before (in my case, on ramps)....but I don't do it.


Our 2017 Explorer with the 6F35 transmission does not have a transmission dip stick, but an easy to access fill tube. So if I want to change it myself, because it's sooo easy to do and inexpensive, I I drive it up on the ramps the night before and change it the next morning. That way the temp of the ATF drained is the same as the temp of new fill ATF. I'm going to change it more often, because it's easy and cheap to do, hopefully I don't have to worry about build up in the base of the pan. We purchased the Explorer new and did the first drain and fill at 12,200 miles.

Whimsey

Re: ATF D/F, hot, warm, or cold ? [Re: hallstevenson] #4694557
03/14/18 11:27 AM
03/14/18 11:27 AM
Joined: Jan 2004
Posts: 4,445
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,445
California
I like to drain lukewarm or warm. Then I set the fluid level to the cold range, go out on a 15-20 mile drive to get the tranny to operating temp and do a check after running the gears and idling. However, if the car had no dipstick Ill check the temp within OEM specs.

Last edited by nthach; 03/14/18 11:28 AM.
Re: ATF D/F, hot, warm, or cold ? [Re: dlundblad] #4694732
03/14/18 02:48 PM
03/14/18 02:48 PM
Joined: Mar 2008
Posts: 7,318
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,318
USA
Originally Posted By: dlundblad
You are supposed to check/ add ATF to a hot transmission.

Say 4 hot quarts drain out and 4 cold quarts are dumped back in... I personally don't think that'd even be enough to matter. Heck, there may even be more user error in the measuring and adding.


This is why I do it cold. Plus the not burning yourself thing

Re: ATF D/F, hot, warm, or cold ? [Re: hallstevenson] #4694787
03/14/18 03:57 PM
03/14/18 03:57 PM
Joined: Apr 2017
Posts: 1,029
Ohio
hallstevenson Offline OP
hallstevenson  Offline OP
Joined: Apr 2017
Posts: 1,029
Ohio
So the consensus is, do it hot or warm or cold.... grin


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