E90Post
 


European Auto Source
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Question about 3 times drop and fill for ATF



Reply
 
Thread Tools Search this Thread
      09-10-2013, 05:10 PM   #1
Nhe261
Second Lieutenant
4
Rep
201
Posts

 
Drives: 2008 335i 4 door
Join Date: Dec 2012
Location: SoCal

iTrader: (1)

Question about 3 times drop and fill for ATF

If I do the 3 times ATF drop and fill with the filter change, when shoudl I change the filter? the first drop or the last?
Thanks.
Appreciate 0
      09-11-2013, 01:31 PM   #2
F32Fleet
BMWCCA since '03
F32Fleet's Avatar
United_States
69
Rep
5,337
Posts

 
Drives: 2015 435i
Join Date: May 2005
Location: Atlanta (Vinings)

iTrader: (0)

ZF doesn't specifically require a full fluid exchange. The unit is good for ~200k miles with pan drop and 6 liters of LG6 every 50-60k miles.

Otherwise install new pan on your third exchange.
Appreciate 0
      09-16-2013, 02:33 PM   #3
HFELIU
New Member
HFELIU's Avatar
1
Rep
17
Posts

 
Drives: '03 SL55, '07 mdx, '07 335i
Join Date: Aug 2013
Location: Central New Jersey

iTrader: (0)

Quote:
Originally Posted by Nhe261 View Post
If I do the 3 times ATF drop and fill with the filter change, when shoudl I change the filter? the first drop or the last?
Thanks.
What exactly is a "3 times Drop"?
__________________
'07 335i E90 Mods: JB4
'07 MDX
'03 SL55
Appreciate 0
      09-17-2013, 01:49 PM   #4
F32Fleet
BMWCCA since '03
F32Fleet's Avatar
United_States
69
Rep
5,337
Posts

 
Drives: 2015 435i
Join Date: May 2005
Location: Atlanta (Vinings)

iTrader: (0)

Quote:
Originally Posted by HFELIU View Post
What exactly is a "3 times Drop"?
Pan drop is a fluid change which only replaces the ATF which pours out when the pan is removed and not the fluid which is trapped in the torque converter. The idea is that if they do a pan drop three times then most of the original fluid will have been removed via mixing/dilution with the new ATF. It's tremendously wasteful because of all the "new" ATF which is being thrown away.

It can be expensive but users usually use a cheap ATF which has a generic approval for the transmission in question.
Appreciate 0
      09-17-2013, 01:53 PM   #5
pgaplayerless
Banned
2
Rep
232
Posts

 
Drives: 335i
Join Date: Aug 2013
Location: United States

iTrader: (0)

Quote:
Originally Posted by Socom View Post
Pan drop is a fluid change which only replaces the ATF which pours out when the pan is removed and not the fluid which is trapped in the torque converter. The idea is that if they do a pan drop three times then most of the original fluid will have been removed via mixing/dilution with the new ATF. It's tremendously wasteful because of all the "new" ATF which is being thrown away.

It can be expensive but users usually use a cheap ATF which has a generic approval for the transmission in question.
Then you have cheap generic ATF inside your torque converter that you wont be getting out......

This is why slushboxes are inferior when it gets to maintenance.
Appreciate 0
      09-17-2013, 02:57 PM   #6
HFELIU
New Member
HFELIU's Avatar
1
Rep
17
Posts

 
Drives: '03 SL55, '07 mdx, '07 335i
Join Date: Aug 2013
Location: Central New Jersey

iTrader: (0)

Quote:
Originally Posted by Socom View Post
Pan drop is a fluid change which only replaces the ATF which pours out when the pan is removed and not the fluid which is trapped in the torque converter. The idea is that if they do a pan drop three times then most of the original fluid will have been removed via mixing/dilution with the new ATF. It's tremendously wasteful because of all the "new" ATF which is being thrown away.

It can be expensive but users usually use a cheap ATF which has a generic approval for the transmission in question.
Yea that's pretty much what I figured, it did sound wasteful to me too.
I just recently did the trans fluid change and just removed the drain plug and got out about 5 quarts, then refilled it back up with new fluid, the few ounces of fluid trapped in the TC can't possibly make that much of a difference when compared to all the fresh, new fluid that was just put in the Transmission (about 95%).
Only reason I can see to do a pan drop is if installing a new transmission pan and changing the filter.
__________________
'07 335i E90 Mods: JB4
'07 MDX
'03 SL55
Appreciate 0
      09-17-2013, 03:50 PM   #7
pgaplayerless
Banned
2
Rep
232
Posts

 
Drives: 335i
Join Date: Aug 2013
Location: United States

iTrader: (0)

Quote:
Originally Posted by HFELIU View Post
Yea that's pretty much what I figured, it did sound wasteful to me too.
I just recently did the trans fluid change and just removed the drain plug and got out about 5 quarts, then refilled it back up with new fluid, the few ounces of fluid trapped in the TC can't possibly make that much of a difference when compared to all the fresh, new fluid that was just put in the Transmission (about 95%).
Only reason I can see to do a pan drop is if installing a new transmission pan and changing the filter.
haaaa there's about 2 quarts in the torque converter if not more....
Appreciate 0
      09-18-2013, 11:58 AM   #8
F32Fleet
BMWCCA since '03
F32Fleet's Avatar
United_States
69
Rep
5,337
Posts

 
Drives: 2015 435i
Join Date: May 2005
Location: Atlanta (Vinings)

iTrader: (0)

Quote:
Originally Posted by pgaplayerless View Post
Then you have cheap generic ATF inside your torque converter that you wont be getting out......

This is why slushboxes are inferior when it gets to maintenance.
Or it's why cheap@sses have transmission problems when they think they know better than the transmission manufacturer (ZF in this case).

The fact remains that the transmission will last longer than many other parts of the vehicle.

200k miles (16 years @ 12k/yr) off a pan drop every 50-60k miles is pretty good IMO.
Appreciate 0
      09-18-2013, 09:14 PM   #9
Chriztofor
Colonel
Chriztofor's Avatar
United_States
42
Rep
2,720
Posts

 
Drives: '06 325i Auto
Join Date: Feb 2010
Location: Chicago Burbs

iTrader: (1)

Quote:
Originally Posted by Socom View Post
Or it's why cheap@sses have transmission problems when they think they know better than the transmission manufacturer (ZF in this case).

The fact remains that the transmission will last longer than many other parts of the vehicle.

200k miles (16 years @ 12k/yr) off a pan drop every 50-60k miles is pretty good IMO.
So far this cheap a$$ is doing pretty good. http://www.e90post.com/forums/showthread.php?t=367729
__________________
If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
Appreciate 0
      09-20-2013, 07:22 AM   #10
F32Fleet
BMWCCA since '03
F32Fleet's Avatar
United_States
69
Rep
5,337
Posts

 
Drives: 2015 435i
Join Date: May 2005
Location: Atlanta (Vinings)

iTrader: (0)

Quote:
Originally Posted by Chriztofor View Post
So far this cheap a$$ is doing pretty good. http://www.e90post.com/forums/showthread.php?t=367729
Uh huh. And who will get top dollar for their car at time of resale? The seller with receipts for ZF parts and fluid OR the seller with the "wink and a nod" multi-spec generic?
Appreciate 0
      09-20-2013, 09:31 AM   #11
Chriztofor
Colonel
Chriztofor's Avatar
United_States
42
Rep
2,720
Posts

 
Drives: '06 325i Auto
Join Date: Feb 2010
Location: Chicago Burbs

iTrader: (1)

Quote:
Originally Posted by Socom View Post
Uh huh. And who will get top dollar for their car at time of resale? The seller with receipts for ZF parts and fluid OR the seller with the "wink and a nod" multi-spec generic?
Resale? I plan on keeping it until the wheels fall off (or the transmission dies) Especially since BMW got rid of the inline 6.

Also, most buyers don't really care about ZF parts/fluids, what they care about is that you maintained your car and how does it ride.
__________________
If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 12:11 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST