SILOO “Smoke Stop” Can, New Old Stock

SILOO Smoke Stop Can New Old Stock  Late 1960s-early 1970s original in fantastic condition.  Designed to be poured directly into a car's engine oil.  The product is formulated to reduce blue exhaust smoke and minimize excessive oil consumption caused by engine wear.It is marketed as safe to use in vehicles equipped with catalytic converters.  Grumps American made items from an era gone by.