Why do people think the normal maintenance of an oil change every 3,000 miles?

I bought a GMC Jimmy and reading reviews and people complained after saying they changed oil every 3 thousand.and now have 200.00 miles. What tune-ups, service Tranny inject cleaning, tire rotation, alignment, moving while leaving the foot on the clutch all the time. Each car comes with an interview and it is suggested that most problems would be avoided. 200,000 for someone who does not change the oil and is a GMC and many miles are lucky. Why do people make such ignorant comments when it's their fault.

It is to sell oil only. I changed the oil maybe every 11,000 more weather needed or not and I just sold only 88 cars Camero with 285,000 miles on it engine Parents who still passed smog

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