Question

Is the Oxford comma grammatically correct?

Answer 1

It can be right or wrong. It really depends if you use the US convention or not. The "Oxford Comma" is just another "way" per say, in contrast to the US conventions.

Answer 2

The Oxford (or serial) comma is the final comma in a list of things. For example: Please bring me a pencil, eraser, and notebook. Use of the Oxford comma is stylistic, meaning that some style guides demand its use while others don't.