Let's think about rumors about longevity. You hear a rumor and really have absolutely no idea how the person treated their car. They could say they changed engine oil every 3k miles, but they could be complete liars. They could have let 20k miles pass by between two oil changes. You just don't know. So, another person might think, "Hey, I need to change oil every 2k miles because that guy's car broke down and he changed every 3k miles." And the disinformation continues.
Personally, I have just followed the maintenance schedule provided by the manufacturer of any car I had. All my cars have made it to 200k miles without major maintenance, and were sold to happy buyers. I am talking about a Jeep Cherokee 1989, a Honda Civic 2000, a Mitsubishi Galant 2000, and a Ford Escape 2002.
Like the second post in this thread says, trust what the engineers of your car said before trusting an anonymous person on an Internet forum. But trust me. 0
