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Message: <blockquote data-quote="sillycarx" data-source="post: 461521" data-attributes="member: 17377"><p>Sorry for not responding to this earlier... but I think my problem is Finally resolved. The problem is the engine heat exchanger. I actually changed my ATF heat exchanger thinking that the problem was the ATF line. But after a few weeks, the problem didn't go away. This time I am quite sure the problem is resolved and the problem is due to the engine heat exchanger. I was also been flushing and cleaning my radiator and I wanted to be very sure that my problem is solved. I am confident it is resolved, cause I've not had problems for the last 1500km, so now I declare case close <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> From what I hear from AB Penang, there was another case of e90 with a engine heat exchanger leak and the symptom is exactly the same. No performance lost, only has oil in the radiator cooler expansion tank.  My mileage was 100k when this happen, and the other car was also around the same. So maybe if you want, it might not be a bad idea to change both heat exchanger at about 100k.</p></blockquote><p></p>