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#2004418 - 09/01/10 11:47 AM synthetic vs conventional transmission fluid
rryam Offline


Registered: 02/25/09
Posts: 28
Loc: NC
I'm about to change my tranny filter and fluid. was wanting to put synthetic back in but not draining the converter, dont know how. Is it ok to mix synthetic with the conventional that will be left in the converter? Auto is a 2003 Gram Am 2.2 4cylcinder 125,000 miles.

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#2004423 - 09/01/10 11:50 AM Re: synthetic vs conventional transmission fluid [Re: rryam]
Mau Offline


Registered: 03/11/07
Posts: 699
Loc: Thornhill, Ontario, Canada
yes its ok to mix
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#2004424 - 09/01/10 11:50 AM Re: synthetic vs conventional transmission fluid [Re: rryam]
sciphi Offline


Registered: 03/24/07
Posts: 10008
Loc: Upstate NY
Disconnect the top cooler line (if it's similar to my Buick, that's the return line), get a barb and a hose, and do a cooler-line flush with the syn ATF. That will get ~90% new ATF into the transmission.

Maxlife ATF is syn, and easily available.
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2013 Toyota RAV4 XLE
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#2004426 - 09/01/10 11:51 AM Re: synthetic vs conventional transmission fluid [Re: rryam]
Kestas Offline



Registered: 06/04/02
Posts: 11732
Loc: The Motor City
There's no harm in mixing the two. But a complete fluid exchange would be better. Search on this subforum using my name for a writeup on this procedure.

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#2004427 - 09/01/10 11:52 AM Re: synthetic vs conventional transmission fluid [Re: sciphi]
addyguy Offline


Registered: 09/08/05
Posts: 14065
Loc: Canada
I just ended up having syn ATF put in my tranny, even though I didn't ask for it, or expect it - shop used Wynn's universal ATF, and it's 100 PAO fluid!

:P
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2010 Kia Soul 2U - 2.0L I-4, auto; 105k miles.
VWB 10W-30; OEM Kia filter.

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#2004538 - 09/01/10 01:14 PM Re: synthetic vs conventional transmission fluid [Re: addyguy]
Kaboomba Offline


Registered: 10/05/09
Posts: 782
Loc: SE WI, USA
@addyguy: groovy. syn ATF = mmmmmmm, goooooood
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Kaboomba

94 Buick Park Ave 108K miles, aging gracefully though totalled!
95 Merc Sable 92K miles, raised from the dead by me



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#2004566 - 09/01/10 01:41 PM Re: synthetic vs conventional transmission fluid [Re: Kaboomba]
rryam Offline


Registered: 02/25/09
Posts: 28
Loc: NC
Does anyone have an idea how much fluid the converter on my trans might hold? 2003 Grand AM 2.2 4 cylcinder.

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#2004677 - 09/01/10 03:23 PM Re: synthetic vs conventional transmission fluid [Re: rryam]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
For a pan drop change, figure you only change about 1/2 the fluid.
Much better than before, but not perfect.
This is why people do line flushes, or install a drain plug on the pan to do subsequent drop drains [to approach 100% after a few changes].

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#2005167 - 09/02/10 12:03 AM Re: synthetic vs conventional transmission fluid [Re: rryam]
Gary Allan Offline


Registered: 09/28/02
Posts: 39806
Loc: Pottstown, PA
Originally Posted By: rryam
Does anyone have an idea how much fluid the converter on my trans might hold? 2003 Grand AM 2.2 4 cylcinder.


Automatic Transmission, 4T40-E Initial Fill..........6.9 quarts
Automatic Transmission, 4T45-E Initial Fill..........6.9 quarts
Automatic Transmission, Total Fill
4 speed 4T45-E..........12.9 quarts
4 speed 4T40-E..........12.9 quarts

7 vs. 13 quarts. Consider that there will be mixing in the converter as you purge it. 15 quarts should be enough to get it somewhere in the 90% range.
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#2007389 - 09/04/10 11:09 AM Re: synthetic vs conventional transmission fluid [Re: Gary Allan]
Cutehumor Offline


Registered: 12/10/02
Posts: 9364
Loc: USA
I do the pan drop/filter change on my 96 sunfire. there's no pan drain bolt in mine. I must have all kinds of ATF mixed in there over the years with no flushing. wink
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09 Chevy Cobalt 2.4L 88k miles Peak 5w30
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