1.1 ,This specification covers re-refined engine oil bottoms, also known as vacuum tower asphalt extender, that may be used in formulating asphalt for pavement construction and roofing. This specification has been developed specifically for these two categories of product and is not intended for other uses. Table 1 is to be used for pavement construction and Table 2 for roofing. “,Re-refined engine oil bottoms”, (REOB) is the prevailing name used by many state highway agencies and FHWA, while “,vacuum tower asphalt extender”, (VTAE) is the preferred name used by the manufacturers of the product. Since each name provides an important descriptor of production elements (“,re-refined”, and “,vacuum tower”,) for the specific product this specification addresses, this specification uses the term “,REOB/VTAE.”,