[[/U]I wanted to get one of these valves for my C300. I get so irritated every time I drain the oil wondering who designed the oil drain in such a way that it flows right into the frame. Anyway my question is, does anyone know offhand the size of the drain plug thread? Has anyone had experience with these valves?

 

Topside oil extraction is very popular with these cars.

 

I have formed a little silicon around the drain ending in a tear shape which drains the drips from entering my sump insulation.