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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-16-2015, 01:21 AM
harleyrob harleyrob is offline
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ATF D/F follow up

Completed AT filter/fluid change month ago and want to do a follow up D/F for good measure. Can I simply drain fluid and add back in the equivalent without bringing fluid up to temp, etc, etc?
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  #2  
Old 03-16-2015, 04:10 AM
davidmaria1 davidmaria1 is offline
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Sounds reasonable. I've done my fluid a couple times, both times I ran it up to temp. I can't think of a reason not to do it cold if you're only draining cold fluid and refilling with cold fluid.
It beats laying under a running car.
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Old 03-16-2015, 11:43 AM
cvx5832 cvx5832 is offline
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Quote:
Originally Posted by davidmaria1 View Post
Sounds reasonable. I've done my fluid a couple times, both times I ran it up to temp. I can't think of a reason not to do it cold if you're only draining cold fluid and refilling with cold fluid.
It beats laying under a running car.
In theory, yes. Unfortunately you can't get it to the proper fill level without starting the car.
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Old 03-16-2015, 11:44 AM
cvx5832 cvx5832 is offline
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Quote:
Originally Posted by harleyrob View Post
Completed AT filter/fluid change month ago and want to do a follow up D/F for good measure. Can I simply drain fluid and add back in the equivalent without bringing fluid up to temp, etc, etc?
It's not the fluid temp that's the big deal, it's that a running car takes up the fluid to fill the torque converter.
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Old 03-16-2015, 12:05 PM
harleyrob harleyrob is offline
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Originally Posted by cvx5832 View Post
It's not the fluid temp that's the big deal, it's that a running car takes up the fluid to fill the torque converter.
But I've already changed the filter and fluid once. If current fluid level is the correct level, then cant i just drain what is in the bottom of the pan (car off cold fluid) and replace with the same amount. I realize some fluid will remain in the TC but surely this will help insure cleaner fluid overall is in the AT. Like, if 75% of the fluid is clean currently this will increase that to say....85%.
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Old 03-16-2015, 06:46 PM
cvx5832 cvx5832 is offline
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Quote:
Originally Posted by harleyrob View Post
But I've already changed the filter and fluid once. If current fluid level is the correct level, then cant i just drain what is in the bottom of the pan (car off cold fluid) and replace with the same amount. I realize some fluid will remain in the TC but surely this will help insure cleaner fluid overall is in the AT. Like, if 75% of the fluid is clean currently this will increase that to say....85%.
No, as in the fluid from the torque converter drains back into the pan when you turn the engine off. The fluid level will be higher than the fill hole when the engine isn't running. This makes it impossible to fill correctly when the car is off.

You can do a D&F cold if you want, but the engine still has to be running if you want to fill it with the correct amount.
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Last edited by cvx5832; 03-16-2015 at 06:47 PM. Reason: Punctuation
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  #7  
Old 03-16-2015, 11:43 PM
harleyrob harleyrob is offline
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Quote:
Originally Posted by cvx5832 View Post
No, as in the fluid from the torque converter drains back into the pan when you turn the engine off. The fluid level will be higher than the fill hole when the engine isn't running. This makes it impossible to fill correctly when the car is off.

You can do a D&F cold if you want, but the engine still has to be running if you want to fill it with the correct amount.
Gotcha! Thx!
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Old 03-17-2015, 03:50 AM
davidmaria1 davidmaria1 is offline
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Quote:
Originally Posted by cvx5832 View Post
No, as in the fluid from the torque converter drains back into the pan when you turn the engine off. The fluid level will be higher than the fill hole when the engine isn't running. This makes it impossible to fill correctly when the car is off.

You can do a D&F cold if you want, but the engine still has to be running if you want to fill it with the correct amount.
Forgot about the t/c. I did mine at running temp. both times. Unscientific at best, but it seems to work.
__________________
THINGS I'VE DONE: Cooling system refresh with radiator, key fob surgery, K&N filter (removed), pulleys and tensioners, ECSTuning aluminum w/p pulley, CCV cold weather, DISA gasket, OFHG, Fuel pump/filter PM, ZF auto trans fluid/filter, motor mounts, fcabs, 2nd trans fluid change, steering guibo, rear wheel bearings and hubs, headlamp lens replacement
VENDORS USED: ECSTuning, German Auto Solutions, Oembimmer, Amazon, Nationwide Auto Parts (salvage)
BMAauto, Autohausz, FCPeuro
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