Just to be clear, the Barnett's manual didn't say why you shoudn't use auto grease and he wasn't marketing any specific grease. The grease drag theory came from somewhere else. That's why I said it would be nice to hear from a grease expert.

Why do you use auto type grease? Does it last longer or is it just cheaper? I've never tried it because I work at a bike shop and bicycle grease is more easily accessible for me.