Gents, It is never bad to use clean, fresh oil, never......but as we see a thousand times in these threads.....mechanically, the issue isn't whether the oil has broken down even though syn's are much better at resisting this, but the small capacity of the mini-filter. Pull one with 6k run through it and compare it to one new but equally filled with oil. Its kind of like the old drug commercial with the egg in the frying pan.....once you hold both filters, it'll be pretty plain.
I'm a firm believer in everyone caring for their own as they choose....do what you are comfortable with.......
jeff