Just a heads up. We usually do oil changes on our other cars 3 or 4 times a year. With the Volt, once every 2 years is not uncommon (with a DIC reading 80% or more). Beware of the oil drain plug . The plug is only 10 MM. Trying to remove it with an open end could lead to rounding, especially after being in for 2 years. I recommend using a good quality 10 mm socket. Just my experience.