Here is a link to the Mobil Synthetic FAQ where they claim to have 100% Synthetic Oil. If they don't, you guys can get a class action law suite going for false advertising:

http://www.mobil.com/mobil1_racing/a...oil/index.html

Here is the except from an embedded link in the page:


Q: "What's the difference between a 100 percent synthetic oil and a semi-synthetic?"

A: All oils are made up of base oil and additives. Fully synthetic oils contain synthetic base oils, and synthetic blends usually use a combination of synthetic and conventional base oils. Semi-synthetic oils or blends may also be blends of hydro-cracked or hydro-processed base stock with conventional mineral base stock.

Don't assume that a "blend" contains a high percentage of synthetic base stocks. The synthetic base oil component can be as little as 10 percent of the total product in these semi-synthetic products.


Q: "Is Mobil 1 a fully synthetic oil?"

A: Yes, it's 100 percent synthetic. The base stocks used in blending Mobil 1 are all "chemically constructed" instead of being simply segregated out of crude oil like conventional mineral oils.


Here is the 800 phone # to call with questions (I'm sure they are going to love this):

800-662-4525