2018 T550 with 1830 hours, noticed a small oil leak on the right side of motor looking at it from the back side, bought the Bobcat protection plus warranty when I bout it back in September with 1815 hours so I figured I would take it and let them fix it, called today and was told that the o ring at the bottom of the dip stick has blown out and that's what is causing the oil leak and they believe it to be excessive blow by and it will need a new engine, the machine runs great and hasn't given me any real trouble beside having to replace the fuel pick up tube in the tank, any one had this problem?