I have a 2017 ecodiesel that is starting to show oil pressure fluctuations. Highway speeds (75mph) oil pressure rises to the 3/4 mark, however it drops to 1/2 as it warms up and at a stop sign at an idle the oil pressure drops to just below the 1/2 mark. There is less than 40,000 miles on this vehicle. The main bearings wearing out? also it is getting poor fuel mileage.