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Old 06-18-2010, 06:26 PM
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Originally Posted by Multibeemer View Post
After reading through dozens of posts on the topic, the consensus appears to be that a good quality Dexron VI ATF is the best choice. But I have a question - since you can't get anywhere near all of the oil out of the tranny during a flush, is there any possibility of incompatibility between the Dex VI and whatever fluid was put in the tranny at the factory (mine is a 2003 4.4 with 78K miles)? Thanks.
The Dexron VI posts you are reading talk about Dexron VI replacing Dexron III, which was the recommended fluid in the GM transmission used in the 3.0. You have a 4.4, and thus a ZF transmission. Read the label on the transmission to see what fluid is recommended for your specific vehicle by BMW.

You will get about half of the fluid out by draining the pan and filter, leaving the fluid in the torque converter, lines, and cooler.

Since you will be combining the two fluids 50:50, it is always best to use the same fluid. If you use a fluid that meets the spec, you should be fine.
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