As a matter of fact I don't believe you.
I have done many a Google search on Synthetic vs Mineral oils and how synthetic oil works. The fact is, the fundamental difference between synthetic oil and mineral oil is synthetic oil is manufactured chemically and mineral oil is natural, obviously right? But what that means is the individual molecules of oil in synthetic oil are all the exact same size due to the manufacturing process, nothing in nature is ever exactly the same.
This allows the synthetic oil to break down evenly where mineral oil has varying molecule sizes that cause the oil to become thicker the longer it is used.
Sources:
How Stuff Works: Synthetic vs. Conventional Motor Oil
Synthetic oil technology