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  #1  
Old 09-10-2013, 12:45 AM
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Should I flush my transmission fluid??

Here is the thing, my 07 E70 mechatronic sleeve is leaking oil, so I have to replace it. By doing so I have to remove the transmission oil pan. I am going to replace the pan that includes the transmission filter...here is the question, should I just top up the fluid or flush the transmission with new fluid??

Btw my E70 has 74k miles on it.
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Old 09-10-2013, 01:37 AM
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There is no right answer for that question. It is a question of whether you believe that changing the fluid will pay off somehow down the road.

What can be said is that if you are dropping the transmission pan, you should change the transmission filter, with an OE filter from your BMW dealer (not a will-fit filter from any source). The filter may or may not replaceable separately. Also, use the correct fluid for your specific transmission. You don't have to get it from the dealer, but a generic fluid that claims to work for all modern automatic tranmissions regardless of the fluid spec they call for is not what I would use. Finally, ensure the fluid level is correct when you refill it.

Now, the debate can start on whether you should replace the fluid (because clean fluid is always a good thing) or reuse it (because there is no correlation to fluid changes and longer transmission life). Pick your position.
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Old 09-11-2013, 01:40 AM
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I say change it. I know all about the arguments about change tranny fluid regularly or never at all. (I am a change it group.) I say change it every 30k miles or 2 years. If you buy a used vehicle, unless you know that tranny fluid changes were done, do not change it.

The issue I see here is that you have opened up the trans. Once you drop the pan and store the tranny fluid, you do not know how much contamination it encountered. In the catch pan, in the jug/jugs to store it, dust and grit in the breeze, etc.

I definitely agree that you should find the fluid recommended by the manufacturer of the trans. If the spec simply says, Dextron VI ATF, buy your choice of premium ATF (I won't name brands for fear of opening a can of worms.)
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Old 09-11-2013, 02:21 AM
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Quote:
Originally Posted by Brian425 View Post
I say change it. I know all about the arguments about change tranny fluid regularly or never at all. (I am a change it group.) I say change it every 30k miles or 2 years. If you buy a used vehicle, unless you know that tranny fluid changes were done, do not change it.

The issue I see here is that you have opened up the trans. Once you drop the pan and store the tranny fluid, you do not know how much contamination it encountered. In the catch pan, in the jug/jugs to store it, dust and grit in the breeze, etc.

I definitely agree that you should find the fluid recommended by the manufacturer of the trans. If the spec simply says, Dextron VI ATF, buy your choice of premium ATF (I won't name brands for fear of opening a can of worms.)
Thanks, yes I decided to replace the oil with ZF Lifeguard 6 Automatic Transmission Fluid - ATF - is the equivalent to Shell M-1375.....I think my tranny oil is bit low cause by the leaky sleeve and I ordered 11 liters
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Old 09-11-2013, 09:05 AM
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Just a reminder. In this case, it is really a top off of tranny fluid. There will still be fluid in the torque converter and a bit in the trans itself. I would guess you are changing 75% of the fluid. I still believe that this is the better course of action.

Please note, there will be people who argue that you should never mix different brands of lubricants nor mix old and new fluid. I see topping off in this instance as the lesser of evils. Unless you want to go through a full transmission flush.
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Old 09-11-2013, 09:27 AM
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I say do the repair work and top of the tranny with new fluid. Mixing fluid brands is ok as well. Go ahead and pay extra for the ZF recommended fluid or use a suitable alternative. The "lifeguard" fluid is highly refined and more resistant to heat degradation and hence its longer life span. However, if you use a cheaper suitable fluid then you should probably change more often. There is nothing magical about the ZF (or Shell, or whatever) recommended fluid, it is just high quality stuff.

For those who will say I am full of it, I have real world experience. On my E38, I changed the fluid at 100k miles with ZF (recommended) fluid. The transmission was fine until I removed it at 160k (or so) miles to replace the engine rear main oil seal. I replaced the (ZF) fluid with Royal Purple synthetic (had the proper specs). The transmission operated fine until 215k miles when I lost the first gear drum due to metal fatigue (a common ZF issue not related to fluid type or age). I rebuilt the tranny myself and the internals were relatively clean, no scoring or unusual wear on the steels and the fiber disks were fine (no bonding issues, burning, etc.). O-rings looked good for the age. The transmission currently is running O'Reilly brand synthetic "global" fluid (or whatever it is called) with no problems. I just know it will need to be changed at 60k intervals. But, the price makes it a no brainer.

Do what you will and if you take what I say with skepticism, that is ok as well.
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Old 09-11-2013, 11:08 AM
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what i am going to do is, top it up and run the engine, shift gears and drain. I will do this for 2 times and do the final topping hopefully this will get most of the fluid out. Thank for all the advise
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