Originally posted by
The Oxford comma is used to separate different items in a list.
Which one of these sentences is correct?
In the example you give you are correct, HOWEVER, if the items are equal in nature and do not denote numbers you are not required to separate the last listed item before the "and". The trick is to be consistent so that your reader knows that you are using the comma to replace the linking word.
Example: I like apples, peaches and bananas.