Be careful, I broke a rocker arm shaft on a vehicle covered by carfax and they didn't like my clipboard of notes of oil changes. Luckily I was having a shop do about half of the oil changes. They mulled it over for about a week before they decided to cover the costYep use your own guy. Much better plus records are not required for warranty. I have never had them even ask.
Almost all the time they know if it was lack of oil changes or something else. In fact I’ve known a few who never changed oil and still got covered under warranty.
As long as it doesn’t look like tar inside they will cover it.
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