The Rust Chek cans at crappy tire are better than oil. This stuff is formulated for this purpose, not primarily lubrication...
Runny / thick - it's a catch 22. You want it to be runny so it seeps into the "nooks and crannies". also, the misting action, whether froma can or professional is beneficial...yeah, it gets everywhere.... which is prolly what you really want for rustproofing - no?