My Snapper Fastcut with a 20HP Vanguard B&S engine with about 125 hrs on it is now using oil, has blue smoke coming out the exhaust and today it is losing power to where I can't engage the blades without it chocking down. There is a considerable amount of oil coming out of the carburator and saturating the air filter. Please don't say I have engine trouble. This mower is only one year old. I am having to add about 1 pint of oil for every two hours of cutting. Now that it has lost power, I can't cut any grass. Help!