By law, using AMSOIL synthetic lubricants in place of original equipment manufacturer (OEM)-branded lubricants or practicing extended drain intervals does not void new vehicle or equipment manufacturers‘ warranties.

Misinformation surrounds how lubricant selection and extended drain intervals affect OEM warranties. The truth simply comes down to cause and effect - if the lubricant did not cause the problem, the warranty cannot be voided, period. Lubricant brand, type or length in use have no bearing on the decision.

According to the Federal Trade Commission:

The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket or recycled part. ... The FTC says the manufacturer or dealer must show that the aftermarket or recycled part caused the need for repairs before denying warranty coverage. (http://www.ftc.gov/bcp/edu/pubs/consumer/alerts/alt192.shtm)

If an OEM, dealership or mechanic says using AMSOIL synthetic lubricants in place of the OEM-branded lubricant or extending oil change intervals will void the vehicle or equipment warranty, obtain a written statement to that effect and send it to AMSOIL INC. (One AMSOIL Center, Superior, WI, 54880). AMSOIL will contact the entity directly to resolve the situation. For more information, contact AMSOIL Technical Services at tech@amsoil.com or (715) 399-TECH.