Guardian Pest Control Case Amsoil Study

http://www.amsoil.com/lit/g2244.pdf

Before \AMSOIL
Before converting to AMSOIL
motor oil every truck in the fleet
was running conventional petroleum
oil. Oil changes were performed
at 3,000- to 5,000-mile
intervals.

After AMSOIL
In 1997, Guardian Pest Control converted its entire
fleet of vehicles to AMSOIL Synthetic 5W-30 Motor
Oil and AMSOIL filters. Oil changes are performed
every 12,000 to 15,000 miles.