I have 20% of the Taxable account in OAKBX, I will be really wary of going above 25% if it is Taxable account because for whatever reason you need to sell in future you end up with Tax consequence.

However in a Retirement Account(non-Taxable), I have 50% in DODGX in my wife's 403(b) account, 40% in REREX(American Euro Pacific Growth) in my 403(b). I treat and manage each account seperately.

Irrespective of where the account is, My personal max comfortable level is 60% in any fund.

I know OAKBX has performed great in recent years and excellent fund but I think one should have some allocation in foriegn and small cap fund(closed but good conservative fund like RYPRX has done relatively well in the recent market).