Engine Oil Drain Plug and Engine Oil Level Sensor 1994 Mercedes C280 W202 M104

I am on a search and destroy mission for oil leaks on my 1994 Mercedes C280. First was the valve cover gasket and oil fill cap. Now is the oil level sensor and oil drain plug. These were first identified as problems when I took possession of the car. I think my efforts are paying off because I no longer have a burnt oil or gas smell when the car is parked in my garage after a trip. I timed this project around a scheduled oil change because the parts being replaced are attached to my oil pan.