The Los Angeles Times spells out the fact that the 3,000-mile mantra just doesn’t apply to modern-day vehicles, and that changing the oil every 3,000 miles often means paying two or three times more than is necessary:
Improvement in oils, friction proofing and car engines have lengthened the oil-change interval, typically 7,500 miles to 10,000 miles for most vehicles.
What harm is done by changing the oil every 3,000 miles? Well, no harm is done to the vehicle. It doesn’t help the vehicle either. Think of it like tossing out a half-gallon of milk well before the expiration date has passed: Basically, it’s a waste of money.
Beyond the personal expense, changing the oil more frequently than necessary causes more (negative) environmental impact than necessary. That’s why California has launched a website, checkyournumber.org, where drivers can quickly look up how often the suggested mileage interval suggested by auto manufacturers for oil changes.
“I want to tell the story of the rise of the suburban poltergeist in factual TV from the 1970s onwards, how those reports inspired Ghostwatch, and how the extraordinary reaction on the night Ghostwatch was transmitted in 1992 showed clearly where the real ghosts of our society had now gone to live. They are inside television itself - a strange nether world of PR-driven half truths, synthetic personalities, and waves of apocalyptic fear.”—Adam Curtis (via needmoreguitar)