Atlas copco screw compressor ga 22+

Oil consumption too high of compressor atlas copco ga 22 + . I recently changed the oil filter and also oil was renewed after draining the old oil. after running the compressor for a day it was found that oil was consumed . so new separator was also renewed. but still the oil consumption was high .oil/ air cooler was cleaned also but the problem still persist. As soon as oil is topped up , for sometime around 3 4 hours it shows normal level after that period the oil level becomes low. please suggest what to do.