К, примеру, мы купили насос-форсунку для дизеля, где была добавлена к стомости этих деталей core exchange, которая была больше чем цена самой детали. Никаких возвратов нам не предлагают, если они вообще предусмотрены в этом случае.

Спасибо.

Core Deposits & Core Refunds: Most remanufactured auto parts are sold on a "core exchange basis." A refundable core deposit is usually required when we sell a remanufactured carburetor or other remanufactured parts. (Although sometimes we'll quote an "outright" price which includes the core.) The core deposit is refundable when the customer returns to us the original core, such as the carburetor that was removed from the vehicle to install the new one.

Cores need to be complete, and in rebuildable condition. Return cores to us in the same shipping carton we used, along with a copy of our invoice or a note with name, address and phone. Please pack cores carefully to avoid shipping damage. Send to us in Burbank, CA. The refund is reduced if the core is cracked, broken or severely damaged, or is missing major parts. Some cores may have no value at all, for these reasons. Cores need to be for the same application as the remanufactured parts we've sold. Salvage or junkyard cores, and substitutions are not acceptable unless prior arrangements have been made. Cores must be returned within one year from date of purchase.

Core refunds are issued to the person or business that purchased the remanufactured parts from us, and paid the core deposit, in the same manner as we originally received payment. For example, if payment was by credit card, then the core refund is paid as a credit to the same credit card. A credit invoice will be issued and sent to our customer.

Взято вот отсюда: http://www.proconpumps.com/Page3032.htm

Т.е. своими словами, компания, которая берёт в ремонт какой-то блок (или на замену), устанавливает вместо снятого блока свой. Для того, чтобы вы с ним не уехали, берётся залог, который потом возвращается при установке отремонтированного блока или нового (полученного со склада). Но Вы, выставляя счёт на оплату блока и работы по его установке, должны указать сумму этот залога в этом счёте как core exchange.