2008 Chevrolet Equinox - Why does it consume oil?

Why Does my car use a quart of oil every 1000 miles.99700 miles.

Your answer is actually in the question, you car uses a quart of oil every 1,000 miles because it has 99,700 miles. And now for a more serious and detailed answer. That rate of oil consumption is not a cause for concern. Many manufacturers specify that oil consumption is not excessive on new cars unless it exceeds one quart in 500 miles! Your rate of consumption is likely due to either valve guide wear, or piston ring and cylinder wear, or a combination of both. It might be a good idea, the next time you have your spark plugs replaced, to have a compression test performed. Whatever you’ve been doing for the past 10 years, keep it up, as it’s served you well. Check the oil often and keep it full.