What brand of oil does the HHR 2007 use?

Answer 1

It doesnt really matter what brand you use, but once you start using one brand continue to keep using it. As well as the weight. (like 5w30, 10w30) Different oils have different detergent grades. Some are higher, and some are lower detergents. I would recommend either Castrol or Valvoline 5w-30. Once you hit 100,000 miles, switch to high milage oil, and make sure you keep it changed on schedule. It will keep your engine clean and run for a very long time.