I don't think anyone can reasonably argue against the fact that the more layering of oil container identity by size shape and colour, the less mistakes will be made by the weakish link in any aviation process: the human. We've all accidentally spooned the sugar into the kettle/emptied the milk into the sink. It's cognitive failure. That's why experienced pilots will land with the gear up and techies will stick the wrong oil down the wrong hole. Whoever presided over the change of contract that introduced a change of container should really have seen it coming. Unless of course, they were a beancounter who had no idea of how the moneysaving scheme would impact the shopfloor.
It reminds me of the old maxim that starts off with the coal face describing something as a 'crock of sh*t', and by the time the description has reached top management, it's 'a glistening masterpiece of solid gold'.