http://forums.pickuptruck.com/showflat.php?Cat=&Board=UBB11&Number=360298&page=0&view=collapsed&sb=5&o=&fpart=all I used to take the time and actually try to help these guys on other message boards out, but it's gotten to the point where I feel as if I'm fighting a lost cause. Just take a few minutes to read through this... Here's my favorite post: "Synthetic oil contains polymers and the polymer that is added is polyalphaolefin. It increases lubrication and gives it higher range of temps and some other things that will bore you. Here are some other additives that are in synthetic and blend oils: # Antifoamants # Chlorine-free PIBSAs # Corrosion Passivators # Demulsifiers # Dispersants/Detergents # Emulsifiers # Extreme Pressure/Antiwear # Friction Modifiers/Limited Slip # Oxidation Inhibitors # Rust Inhibitors A polymer is just like plastic which is derived from crude oil. Synthetic oil cannot be made with out crude oil or an oil derivitive."