A forum user, who manages a fleet, wrote he used their motor oil product fleet wide with success. I use their grease, and believe it's second to none.
Here is a snippet from a private discussion with an old-timer here years ago:
"Some would disagree with me, actually most on BITOG would disagree with me on this, but I believe LE (Lubrication Engineers) makes a better product than either Schaeffer's or Amsoil. I worked for Pennzoil for 21 years and LE was one of my main competitors when I was in commercial/industrial sales. I could never switch an LE account over to my product line. It was easy to get a Schaeffer's account. Since retirement I have had several chances to visit the LE corporate headquarters in Ft. Worth, TX and tour their manufacturing facility in Wichita, KS. They are truly a first class operation."