<> the jet most likely crashed there FOR LACK OF FUEL<>
The following graph is evidence that the plane was likely ditched with enough fuel to go another 300+ miles —
https://www.facebook.com/178566888854999/photos/pcb.740971779281171/740971732614509/?type=1&theater
— thus an oil slick from the engines on the ocean floor below is entirely possible along with the fact that there is no debris as it would all have been trapped in the fuselage as it sunk to the ocean floor.
At 19000 ft oil/fuel turns to sludge. It doesn’t flow.