Dear Valdez,
A standard diesel engine requires more protection since its compression is higher than gasoline engines. The grades of diesel oil are therefore a notch or so higher and therefore provide slightly more protection against wear than the standard oils recommended for gas engines. This is my opinion, and for that reason, I will choose diesel oils over gas every time, if the price is equal. As far as your concern about "damage" I am convinced that there is no need for any worry.