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Transmission fluid math problem

 
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Old 01 Jun 2019, 09:32 pm
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Default Transmission fluid math problem

Say a AT hold 10 qts and I replace 3 qts per year. After doing this four times how many qts of the original oil is still in the transmission?

Last edited by circus; 01 Jun 2019 at 09:39 pm. Reason: 4
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Old 02 Jun 2019, 02:16 am
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Default Re: Transmission fluid math problem

3.2 quarts
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Old 02 Jun 2019, 08:27 am
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Default Re: Transmission fluid math problem

I figured it out 10 x .7 x .7 x .7 x .7 = 2.4 qts old fluid. The last 3 qts only replacing 1 qt of old fluid.

Last edited by circus; 03 Jun 2019 at 09:49 am. Reason: 10 x (equation was incomplete)
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Old 02 Jun 2019, 10:10 am
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Default Re: Transmission fluid math problem

I f this is only a joke thread then disregard my comment?

The diminishing amount of original transmission fluid by a dilution formula does not work in the case of ATX fluid changed in the fashion of small amount over a period of time. It is really impossible to replace older ATX fluid completely by dilution factor and only with a complete fluid flush can all the old fluid be mostly removed.


The only reason for the small fluid replacement (most transmission auto 3-6qts) is the loss during the pan service to replace the filter and was never intended as a fluid replacement change.
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Last edited by NitroPT; 02 Jun 2019 at 10:13 am.
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Old 02 Jun 2019, 10:42 am
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Default Re: Transmission fluid math problem

Older brother gave me a $1500 van needing a $3000 transmission. Fluid was black as ink and thick like 40w. To avoid a similar fate in our other cars, my younger brother claimed a simple drain a fill would suffice which I disagreed but couldn't offhand justify the logic.
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Old 02 Jun 2019, 11:27 am
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Default Re: Transmission fluid math problem

Quote:
Originally Posted by circus View Post
Older brother gave me a $1500 van needing a $3000 transmission. Fluid was black as ink and thick like 40w. To avoid a similar fate in our other cars, my younger brother claimed a simple drain a fill would suffice which I disagreed but couldn't offhand justify the logic.
The discoloration in the fluid could be a few things not always bad fluid so to say.
The only way to get the "facts" about what is actually going on in both the transmission (better guess as the failing parts) or condition of the fluid is to have the fluid sample tested.


https://www.blackstone-labs.com/engi.../transmission/
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Old 02 Jun 2019, 12:21 pm
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Default Re: Transmission fluid math problem

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Originally Posted by NitroPT View Post
The only way to get the "facts"... is to have the fluid sample tested.
Your link mentions large fees. The ten qts only cost a little over $30. What can be done if something else is found? Sell it?
I ended up buying a low mileage beater and fixed it up with parts off the gift van. First thing done was a complete fluid change.

Last edited by circus; 02 Jun 2019 at 12:26 pm.
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Old 02 Jun 2019, 12:34 pm
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Default Re: Transmission fluid math problem

Quote:
Originally Posted by circus View Post
Your link mentions large fees. The ten qts only cost a little over $30. What can be done if something else is found? Sell it?
I ended up buying a low mileage beater and fixed it up with parts off the gift van. First thing done was a complete fluid change.
Not sure what you meant?

The oil analysis is :

Sample cost is $28.00 per analysis.

Attention! While the kit is free, the oil analysis costs $28.00.


Unless you know what may have cause the fluid to discolor it is mostly speculation. You can examine the oil pan and filter for metal particles but it is still better to get an analysis to know exactly what is in the oil.
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Old 02 Jun 2019, 12:50 pm
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Default Re: Transmission fluid math problem

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Originally Posted by NitroPT View Post
Not sure what you meant?
.
Tests & Price Lists https://www.blackstone-labs.com/tests/tests-price-list/
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Old 02 Jun 2019, 01:24 pm
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OK well you are reading all the information but more then what you need for a the PT Cruiser or another way to respond......
That really is for business with large FLEET commercial and or industrial vehicles.
The standard test will more then be antiquate for a PT Cruiser, most daily drivers and even full competition vehicles using automatic transmission fluid.
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