Schaeffer Oil, best of the tested according to the BMW thread

http://www.hdforums.com/forum/oil-and-oil-related-topics/372172-went-to-oil-test-schaeffers-oil-blew-them-all-away.html

Now I heard the presentation the rep gave at the car club council meeting, and the claims from Schaeffer Oil are pretty cool.

Truckers get around 65 thousand miles between oil changes,
Dyno testing resulted in around 10 more HP
Increase of about 3-5 pounds more oil pressure
15 to 30 percent cooler running engine,

Now, this is from the rep, and he says all the info is on the website http://www.schaefferoil.com/

In 1839 Nicholas Schaeffer founded Schaeffer Manufacturing Co., which has manufactured lubricants in America longer than any other company.

to balance the "Wonder Oil" info, read this about from an informed and researching skeptic http://www.skepdic.com/slick50.html