Someone is putting it there. There is no way for oil to get from the engine to your fuel tank by natural means. Literally, if you have oil in your fuel tank, someone is sabotaging your vehicle by putting the oil there.
Some truckers use the oil from an oil change as added fuel in the tank. In this case it will Not ruin your tank
In the fuel tank
The question is how did oil get in the fuel tank? If there was very little oil put in the tank as in less than a couple of quarts then just fill the tank full and drive the car. The oil will be burned with the fuel and will do no harm. If there was more than a couple of quarts, you can siphon it out with a hand pump. You can get enough out to then fill the tank and drive the rest out.
No, the flush oil is to clean the parts of the engine that are oiled. If you put it in the fuel tank it will block up tour fuel filters and your carburettors.
Light fuel oil storage tank
is the line that serves as overflow tanks of oil to a tank specific to prevent the oil overflows into the sea.
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Here is a tank chart that should help. Generally, the oil tank has a bit of "headroom" at the top, so, for example, a 275 gallon tank only holds about 256 gallons of useable fuel. Check with your local fuel company to determine the useable fuel volume your tank contains. http://www.sippin.com/oil%20tank%20measure%20chart.htm
Getting rid of an old oil tank is a difficult task. The oil will have to removed first. You may be able to donate the oil. The tank must them be cut in half in order to get it out of the house. Call your local trash collection company to find out where you can take the tank for disposal.
That depends on the amount of oil in the gas tank. Most the time, if the amount is quite a bit, then you may have to replace your gas tank completely because oil can cause future problems with your fuel filter and even your pistons.Read more: How_do_you_remove_oil_from_your_gas_tank
Fuel oil tanks should be cleaned about every three to five years. You should hire a professional to clean your tank, because as well as cleaning the sludge out of the tank, they can inspect the tank for rust and other potential dangers.