I have this machine with th 31 briggs on it, it uses a quart of oil every 3-5 hrs, the motor has 1000hrs. It does not smoke or leak oil from anywhere I have found. It did have a major oil leak in warranty coming from the place where the governer goes in the motor, that was repaired. Now it just drinks oil. Where can it be going? With no blue smoke or visible leaks, this is confusing?