[SVOboy]

Check it out at ABG:

This is what the State of California says. Or more exactly what the California Integrated Waste Management Board (CIWMB) says. The fact is that most drivers (including myself) change their oil every 3,000 miles (or 5,000 km) even though many automakers now recommend service intervals of 5,000, 7,000 or even 10,000 miles for most modern cars.

Research by the CIWMB shows that nearly 3 out 4 Californians change their cars' oil before it is really needed. This generates millions of gallons of waste oil, a product which is potentially very polluting.