The readme for media pack B75461-01, aka “Oracle Linux 6 Update 5 (6.5.0) Media Pack v1 for x86 64 bit”, see https://edelivery.oracle.com, states the following about getting the “Unbreakable Enterprise Kernel (UEK)” installed and running:
For compatibility reasons, the default installation image of Oracle Linux boots the Red Hat compatible kernel to perform the installation. Oracle provides an alternative installation image that supports the installation of Oracle Linux 6.5 using the Unbreakable Enterprise Kernel (UEK) as the installation kernel. This installation method also supports creating a root file system using the Btrfs file system.
Further on they recommend to download both the “Oracle Linux 6 update 5 DVD media” (pkg#1) and the “Oracle Linux 6 update 5 UEK boot ISO” (pkg#2), mounting and extracting pkg#2 to some tmp directory, mounting pkg#2, replacing the images directory of pkg#1 with the images directory of pkg#2 and finally providing pkg#1 on a path accessible via nfs or http.