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Message: <blockquote data-quote="AmoiSky" data-source="post: 663286" data-attributes="member: 32427"><p>Myezxs, i am currently in the same situation as you but without water leak problem. To stay with N42 or change to M54. If stay, same problem occur over and over again. If change what would be the consequences of the workmanship of workshop and what other cost related after the transplant. Iwas told that m54 is a bullet proof engine. If i am in your shoes, and have enough money i will def change the engine as long as a reputable workshop is working on it.. If ask Gendong, he may change to f30.. Lol.. Do more reading on both engine before you decide.. Lots of write ups and forum like e46fanatics can provide more insights about the engine.. All the best to you.</p></blockquote><p></p>