Most people believe synthetic oil means it is fully man made in a lab. The truth is very different. In 1999 Mobil challenged Castrol in a case with the National Advertising Division. Mobil argued that Castrol’s Syntec was not a real synthetic because it was made from highly refined crude oil instead of lab built molecules. The NAD ruled that Castrol could still market it as synthetic.That decision changed the oil industry forever. Today most full synthetic motor oils you see on the shelf are act