About 100 nm to my destination I started getting low oil pressure warnings. I monitored the pressure and it would decrease to 20psi then spike back to about 50 psi. It was very erratic. It would go down then back up. The last 20 Nm it went to 0 and stayed there for awhile then it would go back up and then back down. I monitored the engine temp and they were consistent at 185 degrees. TIT’s, CHT’s, and EGT’s where all normal and didn’t change. After I landed I checked the oil level and it was at 7.5 to 7.75 quarts.