VW TL 82066 is a technical supply specification, a class of document that occupies a distinct position in the manufacturer's system: where a corporate standard states what must be achieved and a test method document states how it is measured, a supply specification states what the purchaser will accept from a supplier for a defined item, and it is therefore the document that a contract refers to. Specifications of this class are numbered in a separate series and are frequently issued for a particular material, a particular component or a particular class of equipment, which means the scope is narrower than that of a general standard and the requirements are correspondingly more specific. A supplier should confirm the current issue of the specification and the date from which it applies to deliveries.