I have a Toro ZX 6000 that doesn't seem to like hills at any angle you put it on. While mowing my new customer, I noticed the machine was smoking when on certain parts of the hill, mainly when going up the hill. It isn't smoke extremely bad, but enough to make me worry a bit. This engine has maybe 20 hours on it, so I don't want to destroy the thing. I haven't checked my oil level to see if it was too high, but when I last changed it (at 12 hours) I am pretty certain it was at the correct level. Will running the engine like that destroy anything? I know it's burning oil, and tossing a splash in every now and then isn't a big deal - just don't want to cause major damage to it for one customer's site.