Atlas Copco XAS 185 JD7

Hi, I´m having this problem with my air compressor, it´s leaking oil from the outlet valve, the air comes out with too much oil during operation. I have already change the oil separator filter and the problem persist. I´m running the compressor at 100 to 120 psi. What could be the cause of this excessive oil in the outlet? Best regards, Jaime Plascencia