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On my other cars in the past,I changed it at around 30.000, I even cut open the old filters and they were clean. It never hurts to change them, I will do the mustang at 15.000 and see how dirty it is.
I waited till 23k, it was to long.... do it every 15k like ford recomends.
Yes it is very easy, I did not even use jack stands or the line release tool. Here is a good writeup, but skip oiling the filter. https://mustangforums.com/m_3713378/tm.htm