I bought a used Meteor snowblower last winter and didn't get any of the manuals with it. Could someone who is familiar with this kind of blower let me know what the suggested maintenance is on these units? I tried to look for some oil drain plug but have not managed to find one. It wasn't a real hard try more like a quick look. So. What should I do with this puppy to keep it running as good as it has been? It is a 60" wide blower and I have been most satisfied with it.