My INTEK 20 horse YBSXS.7242VF has 122 hours in service. Used oil from day one. I thought it would break in and quit using oil. No such luck. I change oil/filter every 25 hours. Have changed the air filter with brand new three times. Use Briggs filters. Clean air filter about every 10 hours. The engine smokes a little at start and at shut down. No leaks period. Uses half a quart every two hours. My dealer is talking short block! Will Briggs stand good for the repair? Or will I have to hock my firstborn son and eat the repair myself? Could it be something simple like a stuck blowback valve in the head or some such. All replies will be appreciated.