Low Oil Pressure

Hello everyone, I have an oil pressure problem with my new 916 is engine. The oil temperature is 100 C on the ground and the oil pressure drops gradually and rapidly as the plane climbs. I experience this every time but I couldn't find a solution. Especially when the oil temperature is high, the oil pressure drops to 2.5 bar at 7-8 kft. I was experiencing some oil leakage from the turbo. I changed the turbo check valve and the turbo oil leakage was resolved but there was still no improvement in the oil pressure. Can you help me with this situation?