Changed the oil/filter in the 4155HC this evening getting ready for a day of brush hogging. Afterwards I fired it up an let it idle in the shop for a few minutes while putting tools away. When I came back to it I noticed a pretty good oil leak coming from under the filter so I shut it down and pulled the filter back off. The oil filter is a bit hard to see as it is behind the FEL upright and quick connect valves. Shure enough a stray blade of Johnson grass had managed to get under the seal.