I bought my new mower this last spring. Changed the oil at 10 hours then at 50 hours which was right before I put it up for the winter. Filled up the gas tank and added SeaFoam and ran it about 5 mins and put it up. It only has maybe 10 hours on it since that last oil change. After sitting all winter long in my shed should I change the oil before I use it again come this spring. I have heard you should change it after sitting so long. Thanks for any help.