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Old 11-23-2012, 08:07 AM   #1 (permalink)
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Default Transmission Fluid flush or change? or neither

Hello everyone, just recently purchased a 1999 ford taurus wagon with the 3.0L OHV. Car has 97k miles on it and runs ok (so far ive changed out the VSS sensor, alternator, battery, oil change, coolant flush). My question is should I change out the tranny fluid or leave it alone? I know Ford recommends every 30k miles to be changed but i'm not sure if this has ever been done before as the previous owners did not maintain it well. I was thinking of draining maybe 3 qts of fluid and refilling it and driving it for a while ..doing a little every 3-5k miles changing out a few qts at a time here and there. Would this be a wise idea knowing that these transmissions are prone to failure? what would be the best move? Thanks in advance.
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Old 11-23-2012, 09:14 AM   #2 (permalink)
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I would change it. Without a doubt. New filter clean the magnet. Mercon V fluid. Install cooler.
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Old 11-23-2012, 09:17 AM   #3 (permalink)
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so change a little out at a time, not a complete flush?
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Old 11-23-2012, 10:12 AM   #4 (permalink)
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Drop the pan, replace filter, clean the magnet, reinstall pan and refill. You'll need 7-8 quarts of Mercon V.

Then drive it for a few thousand miles. THen repeat the procedure except this time just check the magnet and leave the filter alone.
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Old 11-23-2012, 10:16 AM   #5 (permalink)
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Quote:
Originally Posted by petethapitbull View Post
so change a little out at a time, not a complete flush?
Do exactly what Nick (Bull Geek) says. You can even go ahead and drop the pan a third time a few thousand miles after that and change the fluid again (don't need to change filter yet either).

Just remember to user Mercon V ATF and nothing else, anything else can hurt the transmission.
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Old 11-23-2012, 11:51 AM   #6 (permalink)
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^+1 with Nick and Sam. Perform a pan drop fluid/filter exchange. Be sure to use your original pan gasket if it's the reusable oem one. Should be stamped black rubber metal reinforced. The wadded up cork or black rubber ones that come with the filter kit should be discarded. Also, be sure to remove the old filter neck seal from the tranny after removing the old filter. New seal should come installed on new filter. Slather new seal with fresh mercon v atf prior installing filter.

Last edited by sheila; 11-23-2012 at 11:56 AM.
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Old 11-25-2012, 01:16 AM   #7 (permalink)
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Thanks for the great info - I checked online for some ATF..is Castrol/1 qt. Mercon V automatic transmission fluid good? So many different brands to pick - anyone in particular you guys recommened or used? Or just use any as long as it has Mercon V?
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Old 11-25-2012, 01:24 AM   #8 (permalink)
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I ended up using castrol Mercon V as it was available at the local auto parts store at the time.
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Old 11-25-2012, 02:47 PM   #9 (permalink)
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I just picked up about 8 qts of Castrol Transmax Mercon V. says on the bottle "Advanced formula exceeds Mercon requirements - For use in Ford Vehicles". Im assuming this should be good? Just want to verify before i put it in and damage something. Is there any difference between Castrol Mercon V and Castrol Transmax Mercon V?
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Old 11-25-2012, 03:07 PM   #10 (permalink)
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Since your not knowing if pan ever came off, squirt some blaster or equivalent on every bolt day or two before and then do it again the day of. Don't want any bolts snapping off.

Also to avoid the mess or fluid pull out some.. walmart has a hand pump with a hose. Run the hose down the pipe where the dip stick is, and pump out as much as possible before dropping the pan. You might get about 3 or 4 qts.

I used a felpro blue gasket on my pan.After two years not a drop of fluid leaking. Also if pan is stuck after removing bolts, be careful not to pry to hard when trying to get off pan. Work your way around pan little by little if stuck. Don't want to make any bends.
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