My beloved w140 has been sitting for the last few months waiting for me to order in the parts to fix the tapping noise. Thanks to my subscribers, I was able to narrow it down to a cam oil tube. I could tell the sound was coming from the left (driver's side), so I decided to approach it with cost in mind, and only fix what what necessary. Dont worry there will be a video soon showing how to completely change our every stock plastic tube, along with timing chain guides.