I'm gonna be replacing my 91 civic hatch engine because it has either bad rings, pistons or head. It smokes intermittently but runs and drives fine. Does anyone know how long it will last (engine) until I won't be able to drive it anymore because either it will smoke too much (Colorado emission laws) or because it will mechanically not be drivable for some reason? What usually happens to the engine if rings/pistons/head is bad eventually if ignored, which it will be until I get money saved to get swap done? does it blow or what? It has been doing this for at least 6 months or more already...Kai are you out there? please help!