helo , i want to speek about the first pic in which you ask about the yellow wire ,
i am a owner of 2 cultus , one is 2006 which i buy second hand , and other is 2007 which i buy zero meter and both are in my use till now , i tell you that in my 2007 model there is no such yellow wire , i check all that in detail becase i am also messing with this cable in my 2006 cultus for some time and eventually i cut this cable out ,
this cable is not of temperature , temperature cable is on the right size of engine near timing belt cover below the carb , both looks same but this yellow one is not a temperature wire ,
if any one know about this wire then let me know also , because this cable is seen only in selected models of cultus ,
do check my forum as well , i am rebuilding my 2006 model cultus ,
thanks
https://www.pakwheels.com/forums/performance-modification-tune-up-preventive-maintenance/181721-cultus-engine-body-overhaul-rebuild
and about that oil , clean your CNG cylinder , there are lot of oil in it and also change your gas filling station , the compressor of that CNG station is poor and its gas is filled with oil ,
and second thing , that oil must be sucked through the carborator instead of laying on the air filter , the reason why carborator sprays that oil is because of the week engine valves , week valves sparays fuel from carborator to the air filter , and in this case you are running your car on CNg which is not a lquid and the only liquid which is sprayed by the carb is the oil which is carried by the CNG , if you run your car on petrol then your carb will spray petrol , you can check it , but you will not see any traces of petrol because it will evaporate , but you can see the sprayed petrol while the air filter is removed and car is on high RPM ,
hope this will help you ,
thanks