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I have my own opinion based on facts and research done years and years ago that I can't find so I'll just paraphrase.
Oil isn't what needs to be changed that often, Its the filter. Filters are usualy only good for 3000 miles before they start backing/letting particles through.
My rotation is the following
Real oil - filter change at every 3000 miles complete change every 5k miles.
Synth oil - Filter change at every 3000 miles and complete oil/filter at 8k miles.
My wifes truck gets whatever Toyota wants done to it cause when/if it breaks they will be paying for it.
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