transmission fluid changeout frequency

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Old 06 Feb 2006, 11:08 am   #1 (permalink)
onehappymadman@yahoo.com
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Default transmission fluid changeout frequency

Hi all,

My Haynes manual says the '96 camry only holds 2.8 quarts of ATF. (Of
course, my Haynes could be wrong.)

Is this ATF volume similar on the '01 camry? (I don't have a Haynes
for the '01.)

What volume of ATF will come out when draining the plug?

I'm planning on changing my dad's ATF, and I'm trying to figure out how
many "changeouts" will be needed to thoroughly clean out his tranny
fluid.

I'm guessing 1/3 (or 0.67) of the fluid will come out when draining by
the plug. Let me know if this is wrong.

So, if we drain it once, 0.67 (67%) of the old fluid will remain.

Drain it twice (like, during the next scheduled oil change), we get
0.67 x 0.67 = 0.49 (49%) of the old fluid remaining.

Drain it three times, 0.67x 0.67 x 0.67 = 0.30 (30%) of old fluid
remaining.

Drain it N times, (0.67 ^ N) x 100 gives the percentage of old fluid
remaining.

Of course, I'm assuming the 0.67 number is correct, is it closer to
0.75 or closer to 0.4?

At this rate, it seems that changing ATF along with regular engine oil
changeouts (every 5,000 miles) seems to be the best way to "flush" out
the old fluid. And since he has only 30,000 miles on the car, this is
not as critical as it would be if he'd neglected the tranny oil after
90,000 miles, no?

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Old 06 Feb 2006, 01:33 pm   #2 (permalink)
onehappymadman@yahoo.com
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Default Re: transmission fluid changeout frequency


onehappymadman@yahoo.com wrote:
> Hi all,
>
> My Haynes manual says the '96 camry only holds 2.8 quarts of ATF. (Of
> course, my Haynes could be wrong.)
>
> Is this ATF volume similar on the '01 camry? (I don't have a Haynes
> for the '01.)
>
> What volume of ATF will come out when draining the plug?
>
> I'm planning on changing my dad's ATF, and I'm trying to figure out how
> many "changeouts" will be needed to thoroughly clean out his tranny
> fluid.
>
> I'm guessing 1/3 (or 0.67) of the fluid will come out when draining by
> the plug. Let me know if this is wrong.
>
> So, if we drain it once, 0.67 (67%) of the old fluid will remain.
>
> Drain it twice (like, during the next scheduled oil change), we get
> 0.67 x 0.67 = 0.49 (49%) of the old fluid remaining.
>
> Drain it three times, 0.67x 0.67 x 0.67 = 0.30 (30%) of old fluid
> remaining.
>
> Drain it N times, (0.67 ^ N) x 100 gives the percentage of old fluid
> remaining.
>
> Of course, I'm assuming the 0.67 number is correct, is it closer to
> 0.75 or closer to 0.4?
>
> At this rate, it seems that changing ATF along with regular engine oil
> changeouts (every 5,000 miles) seems to be the best way to "flush" out
> the old fluid. And since he has only 30,000 miles on the car, this is
> not as critical as it would be if he'd neglected the tranny oil after
> 90,000 miles, no?


>From http://www.turboninjas.com/camry/ax1.pdf

1.7qt / 5.9qt = 0.29;
1-0.29 = 0.71

and assuming the tranny volumes are the same for the 2001 model:

changeout % of old fluid remaining
1 71.2
2 50.7
3 36.1
4 25.7
5 18.3
6 13.0
7 9.3
8 6.6
9 4.7

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Old 06 Feb 2006, 07:47 pm   #3 (permalink)
qslim
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Default Re: transmission fluid changeout frequency

Jesus Christ. You're really taking this trans fluid change stuff head on,
huh? You didn't list the engine, but I'm assuming a six, right? Anyway,
rule of thumb we use in the shop for sixes is three quarts. And, your
methodology, though tangled, is about right I guess.

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Old 06 Feb 2006, 11:39 pm   #4 (permalink)
aiuser
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Default Re: transmission fluid changeout frequency

I am interested in this topic also. What did you do for trans fluid
change in the shop? Do you just drain and replace or you actually
remove the pan and clean the strainer?

Thanks

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Old 06 Feb 2006, 11:58 pm   #5 (permalink)
onehappymadman@yahoo.com
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Default Re: transmission fluid changeout frequency


qslim wrote:
> Jesus Christ. You're really taking this trans fluid change stuff head on,
> huh? You didn't list the engine, but I'm assuming a six, right? Anyway,
> rule of thumb we use in the shop for sixes is three quarts. And, your
> methodology, though tangled, is about right I guess.


Oh, sorry, forgot to mention they're both four-cylinder.

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Old 10 Feb 2006, 07:37 pm   #6 (permalink)
johngdole@hotmail.com
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Default Re: transmission fluid changeout frequency

I think every 7500 miles is sufficient, but every 5000 miles will keep
the ATF in better shape. With a strainer/gasket change every 15000
miles. Use the Fram kit with a cork/rubber gasket. About $12 online.

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Old 11 Feb 2006, 09:48 am   #7 (permalink)
Daniel
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Default Re: transmission fluid changeout frequency

Where did you get the idea Fram parts are superior to Toyota?
-------
Old saying, probably as old as commerce itself:
"The sweetness of low price is forgotten when the bitterness of low
quality remains."

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