TL;DR Yes, delete the OEM account.
Before you delete the OEM account, check if you are in the sudo
group
groups
Sample output:
% groups
a_user_name daemon adm cdrom sudo dip plugdev fuse lpadmin sambashare docker sbuild
If you are in the sudo
group, remove the OEM account
sudo userdel --remove --selinux-user oem
If not, follow these steps
Boot into the GRUB menu
Press and hold the left Shift key during boot.
Start the recovery mode
Select the entry recovery mode
Open the root console
Select the entry root
Remount the root partition
mount -o rw,remount /
Add your user in the group sudo
usermod -a -G sudo <your_user>
Continue the boot process
Press Ctrl+C