> A number of people (particularly in the US, but not only) change their oil every 3-5,000 miles for reasons like: There's an even bigger reason it worked like

> A number of people (particularly in the US, but not only) change their oil every 3-5,000 miles for reasons like: There's an even bigger reason it worked like that for so long. Car companies (American car companies) would print in their US manuals that you should change the oil every 3-5,000 miles, while printing in their European manuals - for the exact same car - that the oil change should be every 10,000 miles. I believe this was brought up on Car Talk once, for example. And they even went into a discussion of how it wasn't a units conversion problem - that the kilometers listed in the EU manual were equal to 10,000 miles, not that someone had just switched the units accidentally, etc.