I recently read a report of a guy who had his oil analyzed after an oil change on his direct injection engine, which I believe this one is, and found out that is was considerably thinned as a direct injection engine shoots gas directly into the cylinder unlike conventional injection, which injects the gas into the intake manifold, where it is mixed with air before injecting it into the cylinder. I think he found out that to prevent this from happening, he needed to change the oil at about 3000 miles, which hardly anybody does anymore. Anyone have this engine, and how often do you change yours? I had been waiting until the warning popped up telling me it needed changing. How does the car know when the oil needs to be changed? I don't believe it's based on mileage. Why is this engine no longer available for the Equinox?