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Old 10-15-2002, 05:45 PM   #1
Kha0S
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Question Importance of flush when refilling 4EAT?

My center diff croaked around 42k miles, so, in the process of the rebuild, I got a full transmission flush/fill, etc. on my WRX 4EAT.

I'm coming up on 59k right now, and am dreading the 60k for financial reasons. It's about time that I learn most of the vehicle maintenance anyway, and so, I ask...

How necessary is a flush when replacing the 4EAT fluids? I'm likely going with the Royal Purple synthetic ATF, which states that it's compatible with other Dexron III fluids (ie, can be mixed). If I do a simple drain/fill, will that be realistically sufficient?

Is a flush possible by a mere mortal?

Help me out here, guys.

/Andrew
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Old 10-15-2002, 09:17 PM   #2
Kha0S
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baa-dump!

/Andrew
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Old 10-16-2002, 10:32 AM   #3
bluesubie
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Since you're doing a drain/fill you would probably only get about 70-75%(?) of the benefit of synthetic. It's probably better than none at all though.
Most dealers don't even do a flush when they do 4EAT service.

You could also go to a shop just for the tranny. Then you could space a little bit of time until the 60K service so it would hit you as hard. Plus your dealer service would be slightly cheaper if you tell them not to do the tranny portion.

I seem to recall info on Amsoil's website about DIY flushing.

-Dennis
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Old 10-16-2002, 11:03 AM   #4
Foxbat
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I heard from a Car Talk Show that it is very important to flush the transimission before refilling it otherwise all the metal pieces are still there to further damage the transimission.
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Old 10-16-2002, 11:44 AM   #5
Kha0S
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Bah, the metal pieces are taken care of by the filter and magnets in the pan.

Interesting to hear that the flush isn't part of the normal service...

I'll check to see if there's the DIY on Amsoil's site.

/Andrew
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Old 10-16-2002, 12:27 PM   #6
Kha0S
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http://www.amsoil.com/faqs/faq8.htm

Obviously, we have a drain plug, and the 2002s, at least, have maintenance free ATF filters, so dropping the whole pan strikes me as unnecessary.

The flush approach looks sound, and should get most (~90%) of the old ATF out. I'll pick up an extra couple of quarts of synthetic to have on hand in case I mess something up.

Anyone with lots of 4EAT experience think there will be a problem if I start by draining from the drain plug, adding the drained quantity, then draining after my cooler, starting, and adding as necessary?

/Andrew
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Old 10-17-2002, 11:15 AM   #7
Kha0S
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Jeez... where is everybody?

(bump)

/Andrew
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Old 10-17-2002, 05:19 PM   #8
White2.5GT
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I'm curious as well, consider it a free bump!
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Old 10-18-2002, 11:02 AM   #9
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I need to change my fluid as well and luckily enough my service manuals arrived a few days ago so I can check to see what Subaru recommends.

I'll post what I find from the service manuals.
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Old 10-18-2002, 10:25 PM   #10
Big Joe
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A simple drain and refill won't get all the tranny oil out. There is still a lot of oil in the torque converter. A complete flush will push out all of the old oil. Basically disconnecting tranny lines to the radiator with one of the oil lines draining out and the return line to the tranny with fresh oil. Some shops or gasp Kmart have a machine to do this.

You can do the method you described, drain and fill, drain and fill, etc. Just throw it in drive (foot on brake) to get the tranny engage to circulate the oil. Nothing wrong with this method either, just will take longer.


joe
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Old 10-18-2002, 10:36 PM   #11
portablevcb
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If you are really careful I have seen methods where basically a small resevoir is made with a piston in it. The fluid pumped into the chamber pushes the piston, which forces the new fluid into the tranny. The trick is to shut off the engine when the change is complete.

Since you are spending a bunch on the fluid (synth run about $6 a quart and you need ten of them!) then a trip to a shop may be less expensive than doing it yourself.
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