Improved oil or aux cooling?
Veteran Member
Joined: Mar 2008
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From: Pacific Northwest USA
I'm not sure that too cool would ever cause a durability issue. I think efforts to warm it, as mentioned, are to improve shift quality.
The vast majority of cars use the tried-n-true transmission cooler inside the radiator which, it seems to me, dictates the ATF temp will be somewhere close to coolant temp. Sufficient in most situations but is very plausible that engine overheating could push ATF temps into the danger zone.
Heat is definitely the killer and cooler is better.....but I'm not sure that unusual efforts to keep ATF super-cool will guarantee longer life. Keeping it in the 175-200ºF range, which is comfortably below the danger zone, should be enough to prevent any problems
Cheers
DD
Veteran Member
Joined: Jul 2010
Posts: 7,362
Likes: 1,241
From: Austin tx and Daytona FL.
I'm not sure that too cool would ever cause a durability issue. I think efforts to warm it, as mentioned, are to improve shift quality.
The vast majority of cars use the tried-n-true transmission cooler inside the radiator which, it seems to me, dictates the ATF temp will be somewhere close to coolant temp. Sufficient in most situations but is very plausible that engine overheating could push ATF temps into the danger zone.
Heat is definitely the killer and cooler is better.....but I'm not sure that unusual efforts to keep ATF super-cool will guarantee longer life. Keeping it in the 175-200ºF range, which is comfortably below the danger zone, should be enough to prevent any problems
Cheers
DD
The vast majority of cars use the tried-n-true transmission cooler inside the radiator which, it seems to me, dictates the ATF temp will be somewhere close to coolant temp. Sufficient in most situations but is very plausible that engine overheating could push ATF temps into the danger zone.
Heat is definitely the killer and cooler is better.....but I'm not sure that unusual efforts to keep ATF super-cool will guarantee longer life. Keeping it in the 175-200ºF range, which is comfortably below the danger zone, should be enough to prevent any problems
Cheers
DD
Thread Starter
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Veteran Member
Joined: Oct 2015
Posts: 1,247
Likes: 543
From: Vancouver
I'm not sure that too cool would ever cause a durability issue. I think efforts to warm it, as mentioned, are to improve shift quality.
The vast majority of cars use the tried-n-true transmission cooler inside the radiator which, it seems to me, dictates the ATF temp will be somewhere close to coolant temp. Sufficient in most situations but is very plausible that engine overheating could push ATF temps into the danger zone.
Heat is definitely the killer and cooler is better.....but I'm not sure that unusual efforts to keep ATF super-cool will guarantee longer life. Keeping it in the 175-200ºF range, which is comfortably below the danger zone, should be enough to prevent any problems
Cheers
DD
The vast majority of cars use the tried-n-true transmission cooler inside the radiator which, it seems to me, dictates the ATF temp will be somewhere close to coolant temp. Sufficient in most situations but is very plausible that engine overheating could push ATF temps into the danger zone.
Heat is definitely the killer and cooler is better.....but I'm not sure that unusual efforts to keep ATF super-cool will guarantee longer life. Keeping it in the 175-200ºF range, which is comfortably below the danger zone, should be enough to prevent any problems
Cheers
DD
Either way I guess that is next on my never-ending list
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