The oil’s temperature will be the same as the surrounding water. If you know the temperature of the ocean water, you know the temperature of the oil.
The oil’s weight will not vary with temperature.
Its density relative to water is the best measure of whether it will sink or float. Assuming the oil and water are at the same temperature, which they are, then the relative gravity will tell you that.
Just realized that the oil is being forced through a narrow well and the pressure is very high. So its impossible to estimate at this point in time what the temperature and density of the oil is at the release point.