Originally Posted by bighemi04
Amsoil owns its own testing facility. You can order testing kits from the website with prepaid postage. Once a year oil changes make many people uncomfortable, for that reason we offer oil for regularly scheduled intervals and twice a year changes. All testing of the 25,000 mile oil I have seen, has yielded results that the oil could have been used longer than the 12 months it was used. Please don't forget to clean up the snake oil you spilled.
What he said.
I have been a dealer for 12 years now and have never had a customer comeback and complain about this product or have a mechanical related failure.