I now have 50 hours on my machine. I changed the oil after the first five like the manual said. However, they say every 100 hours which I think is like cars. The manual says every 7500 miles because of the government trying to conserve oil. I guess I will change mine every 50. Should I do it sooner, or later? Also, can I now use synthetic oil? How do you change the oil in this particular model? I did it at 5 hours, but the oil drain plug is extremely hard to get to with a stupid allen wrench. Do any of you have any suggestions for making this easier? The dadgum ROPS is in the way. Just another excuse for taking it off I guess. I'm just afraid that as soon as I do, I'll flip it. Thanks for the help guys.