what happens with a minor oil leak from the vacuum pump? on 2006 BMW 550i

from time to time when driving up a hill, right after starting the car, it will make a noise that is a rough sound. it has always stopped but now I learn I have a minor oil leak. can this be serious?

Asked by for the 2006 BMW 550i
no, it it merely and inconvenience

the noise it to be diagnosed by a technician