Transmission Fluid Change or Flush??

buckyMarch 24, 2011

According to the maintenance manual my wife's 07 Malibu will be due for a tranny fluid change that would require draining the old fluid from the main housing and also the torque converter. A new filter install as well. A buddy of mine has suggested that we have the fluid replaced with a system that pushes new fluid thru the tranny and converter which back washes the filter as well. Requires no dismantling of the tranny, seal etc. I'd be interested in hearing if any on this list have had their tranny fluid replaced using this system and any pros and cons they may have afte doing so. Thanks guys: Bucky2

Thank you for reporting this comment. Undo

lots of misinformed advice on trans fluid changes. most newer cars discourage you from changing trans fluid. lifetime fluid. trans fluid is subjected to less harsh conditions compared to motor oil. does not see high combustion temps and contamination from gasoline due to ring blowby. i like the full fluid exhange route and i also prefer changing filters if they are available. do both, probably the only time you will do it. unless you plan on driving 150k or 200k miles on car.

    Bookmark   March 25, 2011 at 10:37AM
Thank you for reporting this comment. Undo

Really? Lifetime fluid? That sounds crazy. I have become a believer in regular trans service.

My current van is a 2000 dodge grand caravan with 145k and going strong. I attribute the trans service (new fluid & filter) to this. Prior, I had ruined three chrysler/dodge transmissions (an '89, once, and '94 twice) by neglecting the trans.

    Bookmark   March 25, 2011 at 10:53AM
Thank you for reporting this comment. Undo

Appreciate the replies guys. I keep my vehicles for a long time (average 10 years) so preventive maintenance is an important issue with me. The fact that GM has a fluid change in its maintenance schedule excludes the lifetime fluid philosophy. I'm also a firm believer in replacing filters whenever you change fluids. I note that the flushing method for trannys merely "backwashes" the old filter which is then left in place. This has convinced me go the tried and tested method of draining the torque converter and tranny box and installing a new filter. Does anyone on the list use a transmission fluid additive thats supposed to "recondition" seals etc. Never use them myself but some of the old car guys I chum with swear by a few of them. Just curious on this one.
Cheers and thanks: Bucky2

    Bookmark   March 25, 2011 at 1:36PM
Thank you for reporting this comment. Undo

i had a 96 intrepid. got it from original owner at 90k miles. 4yrs old. i did change trans fluid often. hit 150k miles and sold it. shifted fine. pulled lower radiator hose the first year and brown stuff came out. actually looked kinda milky. hmm. never overheated and never used coolant. maybe it had some kind of stopleak in the coolant.

    Bookmark   March 25, 2011 at 2:00PM
Thank you for reporting this comment. Undo

funny, my toyota manual says 'inspect' every 30K. I just had my car in and opted out of the 60K reccomended service...a bunch of checks and an oil change and tire rotataion and filter changes for $379...did not include ANY fluid changes like tranny or coolant......thats extra if needed. I instead opted for the 'free' fluid check with an oil change where they supposedly can check the fluids (from coolant to tranny to brake to power steering) and definitively tell you what needs changing. To my suprise they said the fluids were all fine...even at 60K. So long as it keep my extended warranty in effect....which it does...

The dealer does do the tranny flush with the machine but they said it was not warranted at this time.

From what I have read about that flush...if you get every 30K it should never be a problem but if you wait till 90K it could do more harm than'd have to google to get the specifics...something about metal shavings being pulled places they should not go....? IMO, with a car out of warranty I would not chance it unless I have had it done every 30K or so....and since the dealer said my fluid was good and have not yet had it done....and my warranty ends at 75K so...I'll likely never have that machine do it...

    Bookmark   March 25, 2011 at 4:32PM
Thank you for reporting this comment. Undo

most newer cars discourage you from changing trans fluid. lifetime fluid. trans fluid is subjected to less harsh conditions compared to motor oil.


    Bookmark   March 30, 2011 at 5:50PM
Thank you for reporting this comment. Undo

Just dropping in while looking for information on draining radiator in a 2005 Chevy Colorado Pickup... but this thread touched my other unanswered question, changing automatic transmission fluid.

I had my 2004 Subaru Forester in for a warranty check on corrosion - of course the dealer shop looks for things that need to be done. This car has about 55K miles on it and has been very reliable. The mechanic reported several DYI things and the need to change the transmission fluid. This was recommended a couple of year earlier when I had the car in for new tires.

The Subaru Forester manual doesn't call to transmission fluid change (I'll take another look, maybe it does at 100K miles) - I chock it up as just high profit dealer (not necessary)service and don't get it done. That said all my other cars and pickups over the past 25 years have had manual transmissions, so the subject never came up there...albeit some shops may want to change the manual transmission oil too.

    Bookmark   December 14, 2011 at 10:08PM
Thank you for reporting this comment. Undo

The main difference between older and newer automatic transmissions is the lock-up clutch. During a goodly portion of time on trips with the lock-up, the torque converter is locked, and when locked. it does not add much heat to the fluid. In older transmissions, the primary source of heating was from losses in the torque converter. With the converter locked, the remaining heat sources are gear and bearing losses.

It is my opinion that the lockup clutch contributes to exending the life of the fluid.

    Bookmark   December 15, 2011 at 3:50AM
Sign Up to comment
More Discussions
Lexus vs Toyota Avalon
OK guys, here is another one for you. (I apologize...
Nissan 350Z P1757
My car Nissan 350Z 2007 has an issue. Trouble codes...
too much pressure in cooling system
I have a 95 sable that lost heat about a year ago....
Car suddenly accelerats
This morning my wife was driving our 2013 Chrysler...
dump my buick rendezvous?
Do you know the Buick Rendezvous? Mine has been outstanding...
Sponsored Products
V Rocker SE Wireless Black Game Chair - 5130301
$89.63 | Hayneedle
MIO Alpha 2 Heart Rate Sport Watch
$199.99 | FRONTGATE
Juno Pro-Series 8 in. Jumper cord-Black JC3-8-BL
$10.97 | Home Depot
GARDENA Pruning Lopper - 646
$69.99 | Hayneedle
Bluetooth Stereo Headset
$49.99 | FRONTGATE
Sunny Health & Fitness Pink Magnetic Upright Exercise Bike - P8200
$122.98 | Hayneedle
Juno Pro-Series 34 in. Brush Bronze UnderCabinet Fluorescent Fixtures UPF34-BZ
$89.97 | Home Depot
Juno Under Cabinet Lighting Pro-Series 46 in. Fluorescent Brush Silver
$98.97 | Home Depot
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™