Opel Corsa 1.2s does not start when starting to cool

Good morning everyone,

I have been observing that my Opel Corsa 1.2s of 1990 costs it enough to start when the engine begins to cool. In hot, that is, just stopped and the few minutes start perfectly. It starts with luxury too, but that is when I leave it at an hour or time and somewhat stopped, when it is difficult to start. It starts after several "wing" that I give inside the car to move the liquids and start.

I think I remember that I did it since I threw about 15cl of engine oil to clean the gasoline passage, which is done to the injection engines, but they told me to throw it to this also even if it was carburation.

Conclusion, I think it may be because of that because there is still some oil in the gas tank, that the carburetor has to be cleaned, but I am not very sure. The battery, which influences the start, is perfect, the starter engine is not because hot starts perfectly, another thing I have thought of are the spark plugs. What do you think it can be and what would you start doing to rule out?

Thank you very much

Cleaning oil? Who told you that, has no logic for carburers or for injected, to start the oil never clean, I also do not think it is the problem of the vehicle, it is rare that it is neither cold or hot, but only after an hour, I recommend that you check when it is difficult to leave if the spark is and if it is good, or the other that when it costs to leave the gasoline by the carburetor. Fuel problem and attack there, if it is spark we attack there, but let us determine what is the element that is missing or failing. Test and let us know