If your impressed so far wait until you use it. it rarely if ever clogs in any kind of snow. pure slush or even standing water will get pumped through it if its in a deep enough puddle. the more snow you feed it the farther it throws. i will never use a different machine.
I have three of them. have a couple of pictures in the photo gallery. the transmission in that snowblower is made by foote. no longer available for parts or as a whole.
if its the engine i am thinking it is a kohler k141 engine. 6.25 hp use the following link for service manual, it will give you what oils to use when. 5w30 or 5w20 are called for in cold weather.
bad news is i haven't been able to find anything regarding manuals for the snow blower except one on ebay and i am not willing to pay for a generic manual that won't show much since it is just an owners manual.
good news is i have had that machine torn down to nothing and except for the trans and the impeller shaft (not the auger shafts- they can easily be made if needed) every thing else is generic stuff. i just replaced every chain and bearing on the one in the gallery through grainger. spent about 130 for all new bearings and chains.
i will look for the info i have for the trans. it shows a parts diagram but thats it. i will check mine for what lubricant is in them.