That's the crux of the problem with "OEM".

Many times we believe that the OEM part is identical to the OE part because the manufacturer of the OEM part is the same as the manufacturer of the OE part.

But, there is no specification for the OEM part other than whatever the manufacturer chooses. So, in the case of the valve, the manufacturer substituted a cheaper valve without sodium and stamps his name on the valve. Most customers will value the name and determine that it's the same as OE. But, in reality, it's no better than an aftermarket part.

It's a sad commentary with regard to "OEM" and we ought to be as careful as possible when purchasing same.

With regard to some suspension components such as Lemforder, I "think" that we can agree that OEM is the same as OE.........but........in reality.........how do you know with certainty?

I recently heard of issues with aftermarket engine mounts. Apparently, some of them are nowhere near as durable as OE and last a fraction of the time as OE. Not sure if those mounts were OEM.......or not.