The owner's manual on my 2005 TrailBlazer shows how to re-set the oil change warning light by using the ignition and tapping the brake. I have, with previous vehicles, changed the oil every 5,000 km, but there is no such recommendation in the owner's manual.

I have now gone about 11,000 km since the last oil change; the oil appears to be clean and at the correct level, not surprising with an oil capacity of 7 litres of 5W 30. How many km (or miles) must generally pass before an oil change is required?