Given the formulation of today's synthetic oils I adhere to the manufacturer's recommendation of a 5k interval.
If someone finds comfort in an accelerated frequency, that's between them and their wallet. I can find other, more useful, places to throw money.
Sampling oil to determine if there is a noticeable difference between a 3k and 5k replacement interval sounds like OCD... to me, anyway.
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Like I told you. What I said. Steal your face right off your head.