Rev is right.
That's why I don't bother with synthetic oil. The expense of doing the necessary changes with synthetic oil is too high, even with the real benefits the synthetic offers.
I change oil and filter (Mobil 10-30/Motorcraft filter) every 2,000 miles; no exceptions, ever. Knowing how quickly oil becomes contaminated, I like the idea of having everything fresh as often as possible. I would change it at 1,000 miles but that would be make me a fanatic. Hmmm.
112,000 miles and still running great.
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