Oil, Water, Knights

Normal sudoku rules apply.

Cells a (chess) knight's move apart cannot contain the same digit.

Digits in cages do not repeat.

Each cage is either full of "oil" (even digits), full of "water" (odd digits), or a mix of both. In all cases, each "row" within a cage is of just one type (oil or water). Oil floats on water, so even digits will always be in rows above odd digits in mixed cages.