We have GE 9E frame 116 MW. past few months more oil mist comming out from the dicharge and showering near by more. we have changee filter elmenments, we check oil collection drains for any chock nothing found so far. Can any one tell what is the root cause?

May be increased sealing air from bearings passing into the oil console. Check for clearances.

check performance of oil mist fan and fan suction valve position.