John Deere L118 with Briggs Intek 22HP engine

[Bill;]

Tractor runs strong but has recentlly developed an oit leak on the right side only while running after it warms up. Difficult to tell wherer it comes from as it pools on the frame under the dip stick. neither the dip stick or drain pipe appear to be involved. Any suggestions?

 

[ILENGINE]

The only other thing is that area that could cause a leak is the sump gasket. The harden over time the sump bolts loose torque and then part of the gasket gets sucked inward causing an oil leak. Since the sump gasket is above the oil line then it will only leak while running.