I have a 1999 Model 873 with a steady oil leak. The machine has just over 2200hrs. My local bobcat dealer is telling me that I need a head gasket. I have a couple of buddies with backgrounds in diesel machanics that are telling me that it is highly unlikely that the oil leak is coming from the head gasket. Anybody have any comments or suggestions? One mechanic that looked at it (I wasn't there at the time) told me that it is the rear main seal.