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Message: <blockquote data-quote="sillycarx" data-source="post: 410796" data-attributes="member: 17377">Hey, I am facing the same prolbem on my E90 325 2005. I changed my ATF at 98k, and then when I did my 100k service, I saw that my radiator water was full of milky brown sludge. So, the engine oil which got drained was completely clean, so there was no cross contamination. And then I took the car into AB penang, and they drain the ATF, and the ATF was clean. So the Penang AB said, they have no idea, since engine oil is clean, engine block was good, ATF oil was clean. they only requested me to flush my radiator and see if the problem goes away. There was few screw up. When I changed my ATF in AB glemarie, they only put in 5l of ATF. ( kinda weird, but at first I didn't think too much of it). Then yesterday, when I took the car into AB penang, they drained the ATF, and saw it was clean, and put it back. But when they put it back, they had to put in extra 3 L. So even if the AB glenmarie only put 5 l, you only need to add extra 1-2 L and not 3L. I wonder if the contamination is from the ATF, and it is a 1 way contamination like FIR767 said.</blockquote>