There are probably enthusiasts from every major blender on this site, some of whom used to identify themselves (I thinking of Johnny). They particiapte more as members than company representatives, though. If you want to read and post about oil, there really isn't anywhere else to go.
The membership here is too small to have all that much influence. However, if you look at various marque enthusiast sites, you'll find BITOG quoted or linked to on a regular basis.
This site has become the reconginized source for motor oil advice.