Just did 4.8is transmission oil pan drop and filter.

[dkl]

You can do a relatively "safe" flush by disconnecting and draining at the transmission cooler line while filling it normally at the fill hole with the engine running until you see clear fluids flowing out of the line. That should get most of the old fluids out of the torque converter. This is how my indy did mine a couple of years ago. It did took approx. 12 to 14 liters of fluids to do this.

[SlickGT1]

Originally Posted by dkl

You can do a relatively "safe" flush by disconnecting and draining at the transmission cooler line while filling it normally at the fill hole with the engine running until you see clear fluids flowing out of the line. That should get most of the old fluids out of the torque converter. This is how my indy did mine a couple of years ago. It did took approx. 12 to 14 liters of fluids to do this.

This is what I would be afraid to do. You will probably stir so much crap up, that it might shock the trans. Somehow it does know/measure adaptations. I feel perfectly fine dropping the pan the first time. Then I will just drain via the plug, and fill every oil change. In no time, the fluid will be at 99% renewed.

[mgbmwx5]

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[jcorreanyc]

Getting ready to do this on my 4.8is. I bought this huge replacement drain bolt. It looks like it requires a 17mm or 19mm male hex/Allen key to turn this. Is this the right drain plug or is there another?

[mgbmwx5]

This should work Stops, Drains & Drain Plugs - Plumbing*at The Home Depot

[mgbmwx5]

Originally Posted by jcorreanyc

Getting ready to do this on my 4.8is. I bought this huge replacement drain bolt. It looks like it requires a 17mm or 19mm male hex/Allen key to turn this. Is this the right drain plug or is there another?

How about a pic so we can see your plug.

[StephenVA]

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This will be my winter project.

[JBF]

Originally Posted by SlickGT1

2. GT1 said start the car and go through the gears, pause 3 sec each time. I was able to shit till 6th standing still one time. After that, wouldn't go past 3. No worries.

I was under the impression you were supposed to do this with the car on axle stands, so the wheels can turn and you can shift through the gears? Did I misunderstand?

Also where are you getting the oil temperature from - DIS, INPA?

[Jungerishere]

You don't spin the wheels when manually changing into different gears. There is no trans temperature reading in DIS or INPA unlike VCDS for Audi, Porsche, VW...

Originally Posted by JBF

I was under the impression you were supposed to do this with the car on axle stands, so the wheels can turn and you can shift through the gears? Did I misunderstand?

Also where are you getting the oil temperature from - DIS, INPA?

[LVP]

I was under the impression you could get the trans temp reading by going through the DIS procedures for checking or filling the trans fluid. Can someone who has done this with DIS confirm? It seems so critical to the process, I can't imagine BMW would leave it to every mechanic to have a hand held pyrometer to measure temp at some randomly chosen point on the trans. I do plan to go through the level check procedure in DIS within the next month or so. When I do, I'll snag some screen shots. Would be good to know beforehand though

Cheers.