What I said was
"some oil leaking out around the rockers and shaft as well as some oil spraying from the rocker arm tip on to the top end of the valve - valve spring."
I did not say the top end of a slant sprays oil everywhere, what I said is there is an oil passage in the rocker arm that leads to the valve tip and some oil should be spraying from that rocker arm passage to the tip of the valve. That oil lubes the sliding action of the rocker arm over the valve tip and that oil also helps to cool the valve springs.
