Quote Originally Posted by Scott Larson View Post
Duly noted Trek. It's really not even "oil vapor" as much as it is simply mechanically splashed oil being flung out of the open filler neck. The only thing nobody can argue is that it makes one hell of a mess... Rustproofing, yea that's it!
Oil being flung sure isn't the only thing it's looked like even when I've ever just had my engine running with the oil filler cap off, and that's not even considering the possible air currents that would be occurring under the hood while driving, but I'm not going to get into an argument about it when I've seen it for myself.