It is easy to remove the valve cover and give the rockers and stuff a little oil. I think it is a good idea to oil them up some too. The only way for oil to get into the rocker area is from blow by past the valve guides and up past the lifters in the cambox area. So about all that gets into the rocker area is a little oil mist. Now that little oil is usually all that is needed, but I think oiling the top end a little more is a good idea. You may never need to bother with it again after that first time, except to check the valve gaps off and on.