Подскажите, кто такие contract blenders. Речь о каналах сбыта.

“That seems t o be on account of automakers’ existing contracts with lube [contract blenders] need to play out .”

Automakers claim that their oils cost more than industry brands because their distribution channels, which include contract blenders, automakers and dealer agencies, are more complicated. Genuine engine oils are offered by auto repair shops and mechanics and can also be purchased over the Internet for home delivery.