Panel Filter

Can someone help me in choosing a panel filter. Example BMC or K&N.
I spoke to Subaru Docklands and I was advised not put a oil type panel filter in the car only a dry filter.
Has anyone been told this and why if it is true.
I spoke to Subaru Docklands and I was advised not put a oil type panel filter in the car only a dry filter.
Has anyone been told this and why if it is true.