Now time is due for overhaulding my woo's engine for first time. engine has eaten 2 litre Oil in just 1400 km , there is a lot of black carbon found in silencer. tough pick is still good and no smoke but Mian khan advice me to get overhauled the engine coz Mobiloil consumption speed is so dangerous , he give me estimate Rs.15000-18000 depend on work and 2 days required , so i am willing to get overhauled next month. he told me its the speciality of Petrol/CNG engine that its pick is not become weak while requiring overhauling.