I'm in the process of testing my warning horn/buzzer, which has a constant "buzz" at a low volume and wanted to remove the oil tank (2004 115 opti) to test the oil sensor. I have the service manual and it makes it seem pretty straightforward, however it is quite the challenge. Getting it out was a pain, but getting it back in is even more challenging. Is there a special trick to make this happen? Does part of the bottom cover on the engine need to come off? Part of the challenge is getting the tank in far enough to plug the wire harness and oil line back in, and then to get the plenum on the air intake seated properly as well.