DD15 oil pressure sensor leaking? Removal and Replacement Advice

Has anyone removed one of these sensors? Do I need to drain some oil before removing it?

 

When they start leaking, are they still good to be reused if retightened? Do they leak because they are loose, or broken and needing replacement? I have a new one already. I noticed it comes with a metal washer. I thought it would use a silicone washer.

 

Yup, it was pretty easy and quick. I did end up damaging the sensor clip a bit, but it was still usable. On the bright side, now I know exactly how to remove those tricky clips without damaging them. Freightliner apparently doesn’t sell that sensor clip. They only sell the whole assembly.

 

Use a pick to pull up the gray tab. Be careful not to over pull it. It will pull up some 10% of 1 inch. When you’re ready to put it back together, press the gray tab down, and then install it. You should hear a click.