Proper Engine Oil Weights

What is your recommendation for main engine oil, I am presently using Mobil 5000 10-W 30, I live in Illinois so I will not be using Fergie much in the winter. I have good oil pressure 35 # drops to 25 when bush hogging on a hot day, the engine coolant temperature is 150, cylinder pressure check is within spec’s. October 13, 2015.

Ferguson specified 30 wt. oil for warm weather and 20 wt. oil for cold weather. You can find this information in the operator’s manual and on the engine serial number tag. As long as you have good oil pressure you should be ok using 10w30. If you find the oil pressure dropping while working in warm or hot weather, I would recommend sticking to the 30 wt. as specified.