[ltc8k6]

There’s not enough oil on board to make huge slick.

There’s plenty of kerosene based fuel to make a large slick, but it would evaporate pretty fast.

There is lots of shipping and quite a few oil rigs in the area.

[virgil]

There is lots of shipping and quite a few oil rigs in the area. That's what I thought, too, and one of those might be the source of the oil. But the location of this slick is right about the place you'd expect if information is correct. Then I also wonder if it could have crashed in some remote area of Malaysia, if it did turn back.