[mike sevel]

No, I am not contemplating a sex change! It's my GM tranny in my '08 E93 328i. I have been reading conflicting blogs regarding servicing the tranny that BMW formerly described as having lifetime fluid. They have relented and now recommend servicing.
Since my tranny is 10 years old and driven in Texas heat mostly I decided to have a drain and fill at Aamco. Tranny was operating well but a PM seemed logical. Aamco drained off 4 qts, ran tranny for 10 minutes, drained off 4 more quarts and refilled. They photographed the tranny spec plate and ordered fluid "Max Life D1 equivalent to BMW 8322039147114",
Now the tranny is hesitating, slight clunk in to drive or reverse and acting funky under low acceleration or downshifting.
I could go back to Aaamco but what will they say? I can't prove the tranny was working well before the draining.
Any advice?
Thanx y'all.
Mikey

[German Straight-6]

Originally Posted by mike sevel

No, I am not contemplating a sex change! It's my GM tranny in my '08 E93 328i. I have been reading conflicting blogs regarding servicing the tranny that BMW formerly described as having lifetime fluid. They have relented and now recommend servicing.
Since my tranny is 10 years old and driven in Texas heat mostly I decided to have a drain and fill at Aamco. Tranny was operating well but a PM seemed logical. Aamco drained off 4 qts, ran tranny for 10 minutes, drained off 4 more quarts and refilled. They photographed the tranny spec plate and ordered fluid "Max Life D1 equivalent to BMW 8322039147114",
Now the tranny is hesitating, slight clunk in to drive or reverse and acting funky under low acceleration or downshifting.
I could go back to Aaamco but what will they say? I can't prove the tranny was working well before the draining.
Any advice?
Thanx y'all.
Mikey

man... why would you do a drain and fill? do you change your engine oil and leave your dirty oil filter in place?

the new oil circulating through the transmission must've knocked a tiny metal particle or some shit from your original fluid into one of the transmissions many crevices and is causing abnormal behaviour. I suggest you get your transmission filter replaced ASAP and pray to god that fixes the problem.

if you're just getting a drain/fill, you may as well be throwing your money in the garbage. never keep the old filter

[rick100]

I would reset adaptationa first.

[CTinline-six]

I believe the GM transmissions require Dexron VI. That is the only fluid I would use since it is the OEM fluid for the trans.

As stated previously, I'd also have the filter changed and reset the adaptations. Did they change the filter? It is possible the filter wasn't put back on correctly or the transmission was not all the way full.

[PRmade]

I had a very annoying shudder on my GM tranny, on my 2011 e90 LCI, I changed the transmission fluid (Dextron VI) and filter and also added 4oz of Shudder Fixx, my tranny is running as if it was new. No issues after that. Changing the filter is a MUST.

[N52UNED]

Originally Posted by mike sevel

No, I am not contemplating a sex change!

That's good because you'd be in the wrong section ... that's the Off - Topic area.

[tlow98]

First I would double check that the level is absolutely correct. The procedure is easy to screw up and can cause a lot of the symptoms you mention.

While I would recommend changing the filter there have not been many if any documented cases on here where doing just the oil actually screwed anything up. It's just considered sound methodology.

[tlow98]

Originally Posted by German Straight-6

man... why would you do a drain and fill? do you change your engine oil and leave your dirty oil filter in place?

the new oil circulating through the transmission must've knocked a tiny metal particle or some shit from your original fluid into one of the transmissions many crevices and is causing abnormal behaviour. I suggest you get your transmission filter replaced ASAP and pray to god that fixes the problem.

if you're just getting a drain/fill, you may as well be throwing your money in the garbage. never keep the old filter

So, how would the filter remove a tiny "metal particle" if it's lodged in some crevice of the tranny?

[TemjinX2]

trannies are very picky with there fluid. I would suggest, you switch to OEM fluid and change the filter. Also make sure its not over filled.

[kkasson]

Originally Posted by mike sevel

Aamco drained off 4 qts, ran tranny for 10 minutes, drained off 4 more quarts and refilled.

I'm not exactly sure what this means, but it doesn't sound right. You just want to drain it and refill it - running it to drain more means the transmission is running without fluid. Not the best.

But, I'd guess your problem is just that they didn't fill it correctly.

No harm in draining and filling a healthy transmission. If you're doing the service anyway then you want to change the filter for the long term. But it's not going to cause any immediate issues like that. It's probably just filled wrong, especially since it sounds like they didn't know how to drain it right. When I first did mine I tried to fill it by feeling the pan and estimating the correct filling temperature. I then checked it again using the correct procedure monitoring the temperature through the scan tool, and it was about 3/4 of a quart low. Very easy to do if you're not using the correct procedure to fill it, and it's enough to affect shift quality.

[AWSAWS]

As mentioned above OP, I suspect the fluid level is wrong.

I have a 335i DCT car but the plumbing is exactly the same as 335i autos and so probably 328s.

They should fill the fill hole until fluid emerges. This is probably what they did. They should then replace the fill screw and turn on the engine. The engine should be left running for about 2 mins. This builds up some heat and circulates the fluid through the transmisson cooler and around the trans itself. The problem with not starting the engine is that there may be little to no fluid in the lines and cooler. Also all fluid will gather in the pan which is at the lowest part.

After the 2 mins and with the fluid temp under 40C (104F), you need to open the fill screw again and top up the fluid until it begins to overflow. Then you seal it and you are done.

I used ISTA that reads out the temps from the transmission. You can also use DISv57.
TBH on a cool day with the car sat idle overnight, you could just perform the above procedure quickly and you should get it done before the 104F point. Our cars have a transmission cooler, which will also quickly warm the fluid at the start. Transmission fluid and engine coolant both go through the cooler, exchanging heat.

From what I see, you don't want fully clean transmission fluid. A bit of 'dirt' helps bite on clutches. Maybe it's the same on torque converters. It'll be microscopic particles I guess that don't clog large hoses and pumps.

I put my car on a flat surface and used jack stands. Then a syringe and some thin aquarium hose.