I am having a problem with the hydrostat oil seeping up and around the cap on the top of the tank. I had my dealer look at it and he said the tank was overfilled and removed some oil. This seemed to work for a couple of mows but has returned. I have 17 hours on the machine (61"). Some times it creates a minor drip or 2 and some days it looks like an oil tanker ran aground. The mower seems to run fine. Thanks in advance for any help.