I have a new Power Trac with the Kohler Command 25. The engine only has 14 hours on it but is using oil. Last night, I ran it for 3 hours cutting a field that had been bush hogged two days before. The owner wants to finish cut the field the rest of the summer. Anyway, the outside temperature was about 90 degrees and the engine labored a lot to recut the grass. I had checked the oil yesterday before starting and, today, I noticed that it took about half a quart to bring it back to full. Is this normal in these conditions? Seems excessive to me.