Daughter bought a 2006 Equinox and it spoadically uses engine oil. Sometimes it won’t use any between oil changes and the next time will use a quart in 400 miles. The vehicle has about 40,000 miles on it. What could be causing this?

2006 chevrolet Equinox using oil

spiderman1 March 2, 2010, 2:07am 5

Also the check engine warning light has started coming on , even when the fluid levels are all correct. There don’t appear to be any puddles from engine leakage under the vehicle.