First Transmission Flush at 163K? - Subaru Outback - Subaru Outback Forums

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Old 11-04-2011, 06:26 PM   #1 (permalink)
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Default First Transmission Flush at 163K?

Just bought a 2004 4 cylinder outback, 1 owner drove all 163K mainly highway miles. Her maintenance records didn't show any tranny flush and the oil is needing changed (it seems to be shifting fine, but I want to ensure as long a life as possible).

The risk if I change it - any particles from previous wear that may be helping it shift now will come out and it might be enough to start causing issues.

The risk if I don't - potentially shorter vehicle/tranny life.

Thoughts/recommendations anyone?
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Old 11-04-2011, 06:53 PM   #2 (permalink)
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I'm assuming it's an auto... I've heard of the flushing machines that force fluid backwards through the transmission messing things up. There are machines that use the transmissions oil pump to push old fluid out while supplying new fluid. As for worn material helping things, I don't think that's happening.

You can also DIY by disconnecting the ATF return line from the transmission and draining that into a measured container. Let the engine idle and just remember to replace the fluid a couple of quarts at a time as it's coming out so no air gets sucked into the transmission. Basically, drain the pan. Refill it. Then let the engine idle while in P and replace what comes out of the return line.
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Old 11-04-2011, 07:41 PM   #3 (permalink)
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Presupposing you are capable of working on your own vehicle.

-Buy a new Subaru AT filter. Yes, these are different than oil filters that are usually listed.
-Buy 3 or 4 gallons of Dex III ATF. (Bang for the buck, I suggest Valvoline Maxlife purchased with a discount code from Advance Auto.)
-Buy new crush washer for the AT drain plug.

Pull AT drain plug, drain out fluid, approx 4 to 4.5 quarts. Remove old AT filter and replace. Drive around for awhile,make sure the car gets every gear P through D.
Drain and fill again as your schedule allows. Repeat.

Slowest and gentlest method, will end up with 90%+ fresh ATF when you are done.

DIY here:
Changing Automatic Transmission Fluid (is easy)

FYI: I changed out the (apparently) original ATF in KAyless at 100k. She is a happy wagon now.
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Old 11-04-2011, 07:51 PM   #4 (permalink)
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Quote:
Originally Posted by NotStock View Post
Me either.


Helps with two people.
Be careful with the trans fluid as it will be coming out under pressure and can be a PITA to clean up.
Definitely helps with 2 people. One person to say when a full qt has been drained and another to pour in a fresh quart.
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Old 11-05-2011, 03:33 AM   #5 (permalink)
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No flush ... drain & fill 2-3 times with 10 miles intervals.
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Old 11-05-2011, 10:31 AM   #6 (permalink)
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Thanks all. I should have been more clear - I already have all the stuff and was just plaining to drain/refill a few times, but I had a friend who changed his explorer fluid at 110K and it made things worse (he thought because of "particles" that came out with the fluid not creating the same pressure to shift or something like that).

So I was just looking for peoples thoughts/experiences with doing first tranny oil changes with high miles. I also plan to change the differential fluid as well for the first time while I'm at it.

It doesn't sound like people have had issues after changing original fluid after a lot of miles, so I think I'll move forward in hopes that fresh fluid will extend the life of the vehicle....
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