Hi guys, new here, just bought my first Z4 today. Its a 2006 2.0 SE. Took it for a test drive fell in love lol. I got it for a good price as I was able to haggle on account of the roof motor not functioning. My guess the drain holes are blocked and the motor housing is water logged. I'm not too worried about this as it drives well, and got a full service from the dealer. I'm pretty handy mechanically so I'm planning a new motor and replacing the motor myself. Just wondering if you guys have any tips on things to watch for? It's got just over 79k miles on it. Any tips are appreciated thanks guys.