I have heard that some rebuild things like BB and hubs with heavy motor oil rather than grease for lower friction. I assume that they have to rebuild things quite often, but I don't actually know. Anyone done this? How long do things last and in what conditions? Is this really viable in only a racing application or does it make sense in a street application?
Im sure that this is a "n gain for nx expenditure" question but all I know is how long it would take me to do it, not how much it would improve performance.