That's quite interesting indeed. I suspect this is because the 1.4L engine is now only offered in markets with high sulphur fuel so no longer a case to factory fill with 504/507. The 1.4 TSI was replaced with a new 1.5L model in Europe back when the 7.5 came out but they had to keep the 1.4L model in markets with high sulphur content fuel because the particulate filter etc is not compatible with the fuel.