AMSOIL Dealer in Madison, WI MKH Performance, LLC I am a Full Service Dealer, stocking a full line of AMSOIL products. Servicing South Central Wisconsin since 2011! We provide custom lubrication solutions to all types of customers. From families to trucking fleets, we have the products and expertise to help you save time and money. We serve customers across North America, and we are always happy to help any way we can. Contact us for more information on AMSOIL products, for help determining which products you need or to place an order. You can also order online.