Guys.. my 1.5 Wira is starting to consume alot of black oil. changed it 2 months back for 5k mileage but when i run about 3k it's already below minimum level. Checked for leakage but there's nothing on the floor or on the engine cover. Dunno how old is my engine.. and btw, it emitted alot of white smoke... any idea what happened?

I think I'd need to do a overhaul.. anyone know the average price?