Careful now, someone may start discussing quantum mechanics...
Curious, I always heard that WD40 was designed to be a water displacer for electronic circuits and contacts, not a lube, and wasn't suppose to attract or hold gunk. (Suppose to be good for arthritis, too.)
Here's what The MSDS sheet states as ingredients... does have up to 25% petroleum base oil, though....
Composition/Information on Ingredients for WD40
Ingredient CAS # Weight Percent
Aliphatic Hydrocarbon 64742-47-8 45-50%
Petroleum Base Oil
64742-58-1
64742-53-6
64742-56-9
64742-65-0 total <25%
LVP Aliphatic Hydrocarbon 64742-47-8 12-18%
Carbon Dioxide 124-38-9 2-3%
Non-Hazardous Ingredients Mixture <10%
Found that it can be sprayed on oil stains on concrete, and will remove the oil, and leave no residue behind. Use it for this after O/F changes, cause I'm rather sloppy... tp