re: What percentage of people routinely change their oil?

quote:

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I change mine every 10k miles.

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You are getting downvoted but with moderate quality synthetic oil (ie Mobil 1) most cars are fine with a 10K drain. My travel car usually goes 12-14k before a drain. About once a year, every 3rd or 4th change, I send Blackstone a sample and get a UOA and the results are still good after over 400k miles. It just needs about 1/2 quart top off at about the midway point.

All our other vehicles I change at the 1-year mark regardless of miles unless they go to the track then I change it after the track day or if I do much towing with the SUV then I change at about 5k.