Maxima FAB-1 Air Filter Oil is a highly advanced synthetic filter treatment that provides unequalled protection against the elements. Unlike other filter oils, this time proven formula will not plug foam cells or migrate off of filters. Protective coating catches dirt and fine dust without restricting airflow. Dyed dark blue to ensure even coverage on all surface areas inside and out. Resists washout from carburetor fogging. May be used on foam and fabric filters.