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 manufacturer or dealer must show that the aftermarket or recycled part caused the need for repairs before denying warranty coverage.
AMSOIL stands behind its products and the people who use them. If the OEM claims use of AMSOIL products violates the warranty, contact AMSOIL Technical Services (715-399-TECH). For complete information on AMSOIL warranties, contact AMSOIL Technical Services.