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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Transmission Flush Methods



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      01-24-2013, 05:59 PM   #1
TheeGovernor
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Transmission Flush Methods

I got a good deal on auto tranny fluid and i know there are many ways to flush a transmission. I would replace the pan and filter in either method. Should I

1. Perform the diy method and drain and replace the fluid in the pan

2. Take it to a shop that has a transmission fluid exchange machine(hooks into transmission lines) and let them completely flush my system.

There is a risk of running the torque converter dry for method 2 and it costs more money, but it flushes the whole system so there in no old fluid left in. Method 1 will only get some of the fluid out. BTW car has 93 k miles.

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      01-25-2013, 02:45 PM   #2
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      01-25-2013, 05:04 PM   #3
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I personally prefer method 1. I would suggest doing the fluid fill and drain twice. Fill and drain once, drive around for a week, then do the second fill and drain with pan/filter change. That way you get more of the old fluid out and minimize the risk of "shocking" the system.

I don't like the flushing method, too much risk of some crud getting dislodged. Especially for a car that has so many miles on it, and I'm assuming it hasn't had an ATF change done prior (preferred interval is every 60K according to BMW guru Mike Miller)
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