What is the oil capacity in Mtd snow thrower 8hp?

Depends on the engine. Generally between a pint and a quart. A Briggs and Straton 8hp takes about 24oz. Kohler or TecumsehPower should be close to that as well. If you are changing the oil and the engine has a dipstick, I would put in a pint (16oz) and then check the stick. If it is still low, I would add about 2oz at a time and check again until it does read full. If it is older and does not have a dipstick, just fill it until the oil comes right to the mouth of the fill opening.