Is it ok to change Engine Oil after longer durations??? CT Scott please advice too

[CTScott]

With oil changes I still run with what father drilled into me as a child - 3000 miles or 6 months, which ever comes first. I use synthetic oil, so I let myself go a bit longer to 4000 miles or about 9 months, but with 4 vehicles I can choose to drive (and the fact that I work from my home) I often hit the 6 month mark prior to the miles. My 2011 Tacoma only has 5000 miles on it and it has had three oil changes.