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Posted: 4/19/2017 11:57:31 PM EDT
[#1]
Forcing new fluid through the system has got to be easier than guessing at the mix rate of old and new and slightly newish.
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Posted: 4/19/2017 11:58:40 PM EDT
[#2]
Let's see...carry the one...borrow...tire size divided by pi...
All of them! |
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Posted: 4/19/2017 11:59:39 PM EDT
[#3]
You use a pump and pull the trans lines off of the cooler, you should be able to extract and replace all of it easily, without pulling the plug a million times to get "new" fluid in.
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Posted: 4/20/2017 12:01:27 AM EDT
[#4]
Quote HistoryQuoted:
You use a pump and pull the trans lines off of the cooler, you should be able to extract and replace all of it easily, without pulling the plug a million times to get "new" fluid in. |
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Posted: 4/20/2017 12:03:04 AM EDT
[#5]
you got enough new stuff in there
ETA I did something similar but with power steering fluid recently and I kept doing it until it looked better |
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Posted: 4/20/2017 12:04:09 AM EDT
[#6]
The only time I've ever taken my truck back to the dealer is to have them replace all 16 quarts of ATF in my transmission. I work my truck hard, drive it hard, and tow a lot.
A few hundred bucks every few years is cheap insurance. |
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Posted: 4/20/2017 12:05:48 AM EDT
[#7]
Quote HistoryQuoted:
But OP's approach is like saying "If I have a glass full of ice, and I fill it with bourbon, then I drain all the fluid from it, then fill it with bourbon, then drain all the fluid from it, then fill it with bourbon, then drain all the fluid from it, why did I park my car in my neighbors pool?" Quote HistoryQuoted:
Quoted:
You use a pump and pull the trans lines off of the cooler, you should be able to extract and replace all of it easily, without pulling the plug a million times to get "new" fluid in. 
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Posted: 4/20/2017 12:07:15 AM EDT
[#8]
Is the car on a treadmill.
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Posted: 4/20/2017 12:07:46 AM EDT
[#9]
Quote HistoryQuoted:
Is the car on a treadmill. |
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Posted: 4/20/2017 12:09:40 AM EDT
[#10]
Quote HistoryQuoted:
No, it's in a pool. We've covered this already. Quote HistoryQuoted:
Quoted:
Is the car on a treadmill. *eta* Pretty sure there's a hypotenuse in there somewhere too. |
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Posted: 4/20/2017 12:10:44 AM EDT
[#11]
You are leaving in about 41% of the total fluid each time.
That leaves 5 qts of old the first time About 2 the second .8 something the 3rd... I think...
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Posted: 4/20/2017 12:10:57 AM EDT
[#12]
Its a math question.
The answer is not... just disconnect the trans-cooler return line and pump out all the old fluid. |
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Posted: 4/20/2017 12:16:05 AM EDT
[#13]
Quote HistoryQuoted:
Its a math question. The answer is not... just disconnect the trans-cooler return line and pump out all the old fluid. |
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Posted: 4/20/2017 12:16:13 AM EDT
[#14]
Quote HistoryQuoted:
You are leaving in about 41% of the total fluid each time. That leaves 5 qts of old the first time About 2 the second .8 something the 3rd... I think... |
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Posted: 4/20/2017 12:16:18 AM EDT
[#15]
Ok fine, 87% of the fluid was new now it is 100% contaminated
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Posted: 4/20/2017 12:18:53 AM EDT
[#16]
Quote HistoryQuoted:
Each change leaves 41% old fluid. 0.41^3=8% old fluid after three changes |
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Posted: 4/20/2017 12:21:47 AM EDT
[#17]
Quote HistoryQuoted:
59% stays each time or about 20% after 3 "flushes" Quote HistoryQuoted:
59% stays each time or about 20% after 3 "flushes" Quoted:
Premise: A particular automatic transmission holds 12 quarts of ATF. This particular model has a drain plug. The drain pan holds 5 quarts of fluid. The other 7 quarts are in the torque converter or elsewhere in the transmission, and won't come out if you pull the plug. So... You drain it once. Replace the 5 quarts of ATF. So now you have 5 quarts of new fluid and 7 quarts of new. You drive the vehicle a little and mix up the fluid. Now you drain 5 more quarts. And add five new fresh quarts. And then drive it. Drain out five more quarts of oil and add in five new quarts. So... the second and third drains took out some old, and some new oil. After three drain and fills, how many quarts of old fluid, and how many quarts of new fluid are mixed up in the transmission? Go-- |
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Posted: 4/20/2017 12:25:59 AM EDT
[#18]
I cut out a bunch of little paper squares, numbered to represent the different fill and drain cycles. I acted it out by taking 5 from the original 7 and arranged them in a homogeneous sequence. Did this for each of your cycles. Got a quart or less than the original fluid remaining each time.
Does this help? IDK
Yes I'm really bored 
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Posted: 4/20/2017 12:26:33 AM EDT
[#19]
the problem is after another 5 quarts you get down to 12% and if you do it again 7% so it takes a lot of fluid to flush out all the old stuff BTW this assumes you get a 100 mix ratio and I have no clue if that actually happens. I would drive it for a few days between changes
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Posted: 4/20/2017 12:27:23 AM EDT
[#20]
Whoa!
None of this decimal bullshit. I want to see this done with fractions! |
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Posted: 4/20/2017 12:29:53 AM EDT
[#21]
Have you tried dowsing the tranny?
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Posted: 4/20/2017 12:32:48 AM EDT
[#22]
Quote HistoryQuoted:
59% stays each time or about 20% after 3 "flushes" |
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Posted: 4/20/2017 12:33:27 AM EDT
[#23]
Quote HistoryQuoted:
Whoa! None of this decimal bullshit. I want to see this done with fractions! ETA: 343/728 quarts. |
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Posted: 4/20/2017 12:34:49 AM EDT
[#24]
(7/12)^3 is the percentage of old oil after 3 changes. Right around 20%
12*0.20 is 2.4 quarts of old oil. |
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Posted: 4/20/2017 12:35:11 AM EDT
[#25]
87.
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Posted: 4/20/2017 12:35:51 AM EDT
[#26]
No one is actually answering the question. Sure, (0.58333)^3=0.198 so about 20% is the old oil, but that doesn't answer the question. The answer is about 2.4 quarts of old oil and about 9.6 of new oil.
ETA So another interesting bit is you have removed about 15-9.6=5.4 quarts of perfectly good oil. It is kind of wasteful. |
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Posted: 4/20/2017 12:36:54 AM EDT
[#27]
Quote HistoryQuoted:
Whoa! None of this decimal bullshit. I want to see this done with fractions! step 2 you leave 34% step 3 20.% step 4 12 % step 5 7% step 6 4% step 6 2.4% step 7 1.4% No fractions only % 
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Posted: 4/20/2017 12:37:31 AM EDT
[#28]
Quoted:
Premise: A particular automatic transmission holds 12 quarts of ATF. This particular model has a drain plug. The drain pan holds 5 quarts of fluid. The other 7 quarts are in the torque converter or elsewhere in the transmission, and won't come out if you pull the plug. So... You drain it once. Replace the 5 quarts of ATF. So now you have 5 quarts of new fluid and 7 quarts of new. You drive the vehicle a little and mix up the fluid. Now you drain 5 more quarts. And add five new fresh quarts. And then drive it. Drain out five more quarts of oil and add in five new quarts. So... the second and third drains took out some old, and some new oil. After three drain and fills, how many quarts of old fluid, and how many quarts of new fluid are mixed up in the transmission? Go-- Then you fill it, run the motor to mix it evenly. The second drain removes 5 quarts of a mix of old and new ATF. x/5 = 58.3/100. if you remove 5 quarts, 2.91 quarts is old ATF. and 2.09 is new ATF. Then you fill it, run the motor to mix it evenly. You have 34.08% old ATF. The third drain removes 5 quarts of a mix of old and new ATF. x/5 = 34.08/100. If you remove 5 quarts again, 1.7 quarts is old ATF and 3.3 quarts is new ATF. You have 15 quarts of new ATF mixed in, it's a trick question because some of the new gets drained out, or 5.39 quarts gets drained out. So, 9.61 quarts is new ATF. 2.39 quarts is old ATF. |
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Posted: 4/20/2017 1:01:23 AM EDT
[#29]
79% of your fluid is new, 21% is old.
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Posted: 4/20/2017 9:19:55 AM EDT
[#30]
1385/1728 is new and 343/1728 is old.
Or 9 and 89/144 qts of new oil and 2 and 55/144 qts of old oil. |
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Posted: 4/20/2017 9:26:51 AM EDT
[#31]
87! Wot did I win?
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Posted: 4/20/2017 9:58:22 AM EDT
[#32]
Long story short it would cost less just to have it flushed fully and not retain any portion of the old ATF
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Posted: 4/21/2017 12:02:15 AM EDT
[#33]
I think I did the math right in my response. That's like 99 in arfcom ASVAB.
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Posted: 4/21/2017 12:13:21 AM EDT
[#34]
2.4 quarts of old ATF left, assuming a fairly complete mix between each change
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Posted: 4/21/2017 12:20:34 AM EDT
[#35]
The answer is 87 quarts of stupid. You are wasting transmission fluid and being impractical.
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Posted: 4/21/2017 12:24:10 AM EDT
[#36]
I went to art school
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Posted: 4/21/2017 12:24:47 AM EDT
[#37]
Quote HistoryQuoted:
Have you tried dowsing the tranny? 
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Posted: 4/21/2017 12:27:59 AM EDT
[#38]
Quote HistoryQuoted:
My witchin' sticks kept pointing to his dick. Quote HistoryQuoted:
Quoted:
Have you tried dowsing the tranny? 
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Posted: 4/21/2017 12:40:37 AM EDT
[#39]
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Posted: 4/21/2017 12:50:42 AM EDT
[#40]
Quoted:
2.4 quarts of old ATF left, assuming a fairly complete mix between each change |
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Posted: 4/21/2017 12:55:35 AM EDT
[#41]
cheaper to just replace the transmission
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Posted: 4/21/2017 12:57:04 AM EDT
[#42]
Quote HistoryQuoted:
Whoa! None of this decimal bullshit. I want to see this done with fractions! |
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Posted: 4/21/2017 4:27:32 AM EDT
[#43]
Don't forget to replace the filter too.
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Posted: 4/21/2017 4:32:53 AM EDT
[#44]
The answer, obviously, is 87 quarts.
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Posted: 4/21/2017 4:41:35 AM EDT
[#45]
5:7
58% old remains (7/12). Change 1: 7 parts old. Change 2: 7*.58 = 4.06, 4.06 parts old remain. Change 3: 4.06*.58 = 2.35, 2.35 parts old remain. 80% new fluid, GTG. |
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Posted: 4/21/2017 4:57:55 AM EDT
[#46]
Buy a new car.
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