Got some research about it, they had a little spatter about it in another forum: Brand of Oil Filter? - Page 5 - Mazda MX6 Forums: MX6 Forum

Bottomline, the molybdenum compound they usually use in motor oils is molybdenum disulfide, which, in a way, is comparable to salt (NaCl, Na is Sodium, very volatile metal), it's very different from pure molybdenum.