The same factory treatment that Factory Race Teams and O.E.M.'s receive is now available to all Twin Air customers. Pre-Oiled with Twin Air BIO Foam Filter Oil using state of the art filter oiling machines, which provide ultimate consistency in pore coverage. Same industry leading Twin Air Filter that you are used to; pre-oiled for your convenience. Comes in re-sealable bag for added convenience. Pre-Oiled Pre-Oiled